[Acer Iconia A500] vari9:
List of apps that are optimized for honeycomb!

SOCIAL/MESSAGING/EMAIL/CHAT/FILE SHARING APPS:

Touchdown for tablets - Exchange app

Trendster HD - Twitter trends

Tango Video Calls

Andchat - IRC Client

Glympse

Reddita

TweetComb

Plume

Bluetooth File Transfer

Tweetcaster HD Beta

Friendcaster Tab

Friend Me 6/15/2011

CheckIn for Facebook Places 6/16/2011

BeejiveIM 6/24/2011

Fring

Skype(haven't tested myself)

BROWSERS:

Maxthon Mobile Browser for 10" Tablets

Opera Mini 6

Opera Mobile Web

Dolphin Browser HD

Dual Web Browser 6/16/2011

PRODUCTIVITY/OFFICE/WRITING/DRAWING APPS:

Due Today - To-do list

Docs 2 Go

GoAruna - File Manager and Cloud Storage

Droid Scan Pro - scanner app

Quick Office Pro HD

Springpad

Catch Notes

Notes - Honeycomb's First Note Taking App

dscribble Tablet

MoodWriter

TabSQL (plus Lite)

ClipIT & Unlock key

Notepad

Big Fat Canvas

Splashtop Remote Desktop HD 6/16/2011

Render Droid for Tablets 6/16/2011

A Note HD 6/16/2011

Folder Organizer 6/21/2011

Jot Notes 6/23/2011

Windows 8 Notepad | Honeycomb 6/23/2011

PRINT APPS:

PdaNet Tablet (beta)

PrinterShare

PrintBot

PrinterOn 6/28/2011

NEWS/MAGAZINE/READERS/Stock Market APPS:

Pulse - Blog aggregator

CNN - Very slick design

USA Today

HNDroid HD - Hacker News feed

NYTimes

Financial Times

Stock Alert for Tablets

F5 Reddit Browser

Newsr

Sports Illustrated Tablet

Golfweek

Comics

HoneyReader

Feedly

Taptu

CNBC Real Time

News Republic

News360 For Tablets

Nook for Android by B&N

Reader HD

Zinio

ComiQ Viewer

YourVersion Tablet

Nook for Android

Onion Comic Viewer 6/13/2011

RepliGo Reader 6/20/2011

Reader HD 6/23/2011

Komik Reader Free 6/27/2011

Adobe Reader 6/27/2011

ENTERTAINMENT APPS:

Movies (Flixster)

IMDB (No mention of tablet support, but interface is now clearly optimized for tablets)

TV Shows Stream Lite & Full version

SeriesGuide Show Manager 6/20/2011

Netflix

Hulu plus

Hbo go

SPORTS APPS:

Draft Manager 11

PHOTO/VIDEO/GRAPHICS APPS:

SmugFolio for Smugmug

FlickFolio for Flickr

Zfolio for Zenfolio

PicFolio for Picasa

LifeShow Player - Slideshow software (beta)

Picsay Pro

AutoCAD WS

DroidIris

PhotoVault

VideoVault

nScreen for Tablets

X-Shot Screenshot & Capture

Movie Gallery by dvdcatalyst

Movie Gallery Free (ad supported)

Touchnote - Send your photos as real postcards

Replay Booth 6/23/2011

HoneyGram 6/27/2011

UTILITY /TOOL APPS:

File Station Tablet

File Manager HD

Grocery iQ

Phone My PC

My Verizon Mobile For Tablets

File Station - file browser

aCurrency Pad - A currency converter for 180+ currencies with hourly exchange rates update

myLock for XOOM - quick unlock app

Proximity Screen Off

Status Bar Volume

Screenshot ER (requires root)

Tablet CPU Usage Monitor

App Protector Pro

Thinking Space

Unit Converter - ConvertPad

2X Client RDP/Remote Dekstop

Columnar File Manager

Screen On Toggler

Drive Mount 6/16/2011

UniQPass: Password Wallet 6/16/2011

Quick Panel Settings-Honeycomb 6/16/2011

Mini Info 6/19/2011

Files 6/21/2011

Office VAT Calculator 6/26/2011

NETWORKING/TETHER/REMOTE/CLOUD STORAGE APPS:

Citrix Receiver

Phone My PC

Remote Desktop Client - Settings selection isn't honeycomb-optimized, but it works flawlessly at your choice of resolution once connected

Splashtop Remote Desktop

IP Profiler

LogMeIn Ignition

Wyse PocketCloud RDP Access your computer and virtual desktops from your mobile device.

Dropbox

Minus

KEYBOARDS:

Thumb Keyboard

Tablet Keyboard

Hackers Keyboard

Swype 3.0 Beta 6/20/2011

EDUCATIONAL/CHILDREN:

Monkey Math Tablet Edition

Animals for Tablets

Vizzle Student Player

Merck PTE HD 6/16/2011

Timor The alligator HD 6/27/2011

Kids Shape Puzzle THD Lite 6/27/2011

Kids Connect the Dots THD Lite 6/27/2011

Kids ABC Letters THD 6/27/2011

BOOKS/READERS:

Kindle

Laputa Book Reader

Bible 6/26/2011

WEATHER APPS:

Accuweather

Weatherbug (beta)

xWeather Complete

Barometer HD

TerraTab 6/23/2011

MAP/NAV APPS:

Google Sky Map

Earthquake! for tablets - Seismic activity mapping

Google Earth

MISC APPS:

Androidify

Agricola Score Sheet - No idea what Agricola is, but this is made for honeycomb!

SoundHound

Draw Free - Honeycomb Tablet

The Elements - Tablet

Snaml Book for Android

PaintBox for Tablets

Minecraft Wiki

Sony Pictures

Drawing Pad

Flight Board

Yellow Pages Canada

Bedside (Night Clock)

Gamefly

Appbrain

Webport HD: Travels and Hotels

SunTab 6/19/2011

SmartMoney Retirement Planner 6/20/2011

Face Costume Free 6/21/2011

MUSIC APPS:

Electrum Drum Machine

Qello Tablet

Pandora

Chord! (Guitar Chord Finder)

Musical Pro

Google Music Beta

Midi Mixer 6/16/2011

Amazon MP3 6/27/2011

Qello for Tablet 6/27/2011

Hive Player (Paid) 6/28/2011

Hive Player Lite 6/28/2011

MEDICAL/HEALTH APPS:

Google Body - Awesome!

Fast Calorie Counter Honeycomb

iTriage Mobile Health for Tablets

GAMES:

Shortyz Crosswords

GUN BROS

Fruit Ninja THD

Angry Birds Seasons

Cordy

Monster Madness

Rocket Bunnies

Backbreaker THD

Talking Tomcat

Word Worm HD

Hardwood Solitaire IV

Air Attack HD - portrait mode only, but looks and plays great.

Spectral Souls

Virtual Table Tennis 3D

Samurai II: Vengeance

Radiant HD

Totemo HD

Everlands HD

Space War HD

Evac HD

Buka HD

Vendetta Online

Dungeon Defenders First Wave

Holotaire - Solitaire game

Minesweeper for Honeycomb

Speedx 3D

Tank Hero

WSOP

Deer Hunter 3D

quake3droid

Glow Hockey

Bakery Story

Guerilla Bob

Wheelz

Spider Solitaire

Can Knockdown 2

Random Mahjong

Tic Tac Toe

HISTORY Great Battles Midievil

Backgammon Free

Cyberlords Arcology

Hardwood Solitaire IV

Gin Rummy

Hyperlight

Honeycomb Ping Pong

Riptide GP

Brain Cube HD

Yukon Gold Solitaire

Robotek

Aporkalypse - Pigs of Doom

Battleheart

Contract Killer

My Ouiji Board

T-Racer HD

TileStorm HD 6/15/2011

Mega Slot Pro HD 6/16/2011

Color Confusion 6/16/2011

Galaxy On Fire 2 THD 6/16/2011

Stupid Zombies 6/23/2011

Dead Rider HD 6/24/2011Checkers Free 6/28/2011

WALLPAPERS/THEME APPS:

Starfield Xoom

Xoom Stars

Golf Courses

Multipicture Live Wallpaper

Twisted Colors

Tablet Wallpapers

Honeycomb 3D Tablet

Anipet wallpaper

Aquarium

Blue Skies

Thunderstorm

Flags

Puddle Drops 6/28/2011

WIDGETS:

Beautiful Widgets

Colorize Widget HD

Make Your Clock Widget HD Pro

App Stack

Pure Calendar Widget (agenda)

Wizz (trial)

The Obelisk - Facebook Widget 6/14/2011

Hope this list helps.... (and I took this from somewhere.....will share when on my pc...)