[G Tablet Themes and Apps] reacheks:
So here is what I found out so far. The Nvidia Tegra 2 processor has video encoders built into its chip. These are the specs from their Web site.

Specifications

Processor and Memory Subsystem

Dual-core ARM® Cortex-A9 MPCore™ processor, up to 1.0 GHz

32-bit LP-DDR2, DDR2

Ultra Low Power NVIDIA Graphics

OpenGL ES 2.0

Programmable pixel shader

Programmable vertex and lighting

2x 3D graphics performance of previous generation Tegra

Full High Definition Multimedia

1080p H.264/VC-1/MPEG-4 Video Decode

1080p H.264 Video Encode

Supports multi-standard audio formats, including AAC, AMR, WMA, and MP3

Upgraded JPEG encode and decode acceleration

Rockplayer media player "hardware mode' does not activate on the Tegra 2 when I try several different video formats. It is rumored that Rock Player is working on a beta release that will be optimized for the Nvidia Tegra 2 processor.

From their Web site:

"...RockPlayer support two playback mode: Normal Mode and System Mode. The Normal Mode means RockPlayer will use the playback engine coming with the player, which supports almost all video formats with good enough performance. System Mode means RockPlayer will invoke the playback engine built-in Android system, which support very limit formats but may take advantage of hardware acceleration, which means saving battery. By default, RockPlayer use Normal Mode for playback. You may long press on the file in file list view, touch "Choose playback mode" in popup menu to switch the mode. You may also change the default mode in settings...."

From Rock Player Web Site:

Support Types

Version ARM V7 ： Google Nexus One, HTC Desire Incredible EVO , Moto Milestone XT800, Droid Series,Acer Liquid, Samsung Galaxy S, Sony Ericsson X10 ,Dell Thunder Streak, LG LU2300 .ect

Version ARM V6 VFP： Samsung SHW-M100S GT-i5700 ,HTC Legend ,etc.

Version ARM V6 ： All models left running Android support ARMv6 instruction set.

Nothing yet for the Tegra 2 - Dual-core ARM® Cortex-A9 MPCore™

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EDIT: Rock Player runs on the Toshiba Fiolo 100 (a Tegra 2 platform) but it is NOT "hardware" optimized. Early reports are that it works but still a little slow. The stock media player on the Toshiba is also not hardware optimized, runs only a few of the available video codecs and seems to function well.

Edit: From Android Market the most curent version of RockPlayer is 11.47 optimized for ARMv7VFPV3D16 processor. Nothing yet for Tegra 2 as of 12/01/2010.

Rumor is that Nvidia is developing an integrated media player optimized for the Tegra2. Not too sure how far along they are on the project or if it is just talk.

From their Developer's Web Site:

XBMC

XBMC is an award-winning free and open source (GPL) software media player and entertainment hub for digital media. XBMC is available for Linux, OSX, Windows, and the original Xbox. Created in 2003 by a group of like minded programmers, XBMC is a non-profit project run and developed by volunteers located around the world. More than 50 software developers have contributed to XBMC, and 100-plus translators have worked to expand its reach, making it available in more than 30 languages.

Sooner or later there s/b an optimized Tegra 2 media player that seamlessly utilizes all the encoder/decoder functions this processors offers.

It appears that the most recent version of FLASH (version Adobe Flash Player 10.1.120.1.apk ) may be optimized for this processor. I do know it works quite well.

EKS