Q:

Are there any UI pattern sites with a bookmarklet / selective screen capture (think Skitch) tool? 

For over a year now I've been trying to get into all of these UI pattern sites, but the fundamental flaw I've found across the board is the level of effort it takes to create/post styles you come across in the wild.  This became even more apparent to me as I searched through these sites again today and found barely any new content from what was posted 14 months ago. 
Sites like Patternry & the Open Source Design Pattern Library have the right idea as far as the rest of the metadata associated with the images/patterns themselves, but I'm not finding any that have out-of-the-box browser tools/extensions for accumulating and then identifying/tagging/supplementing those patterns with the appropriate data on-the-go.  
What I'd really like to see is a means to screencap/aggregate a bunch of images before having to go back through and do the time-consuming part.  I know there are tools out there for individual capture, obviously, but I'm wondering if there are any sites that have such a tool as it pertains to their product. 
For the record, I'm also already using library-esque sites with bookmarklets like snip.it and Lookwork, but these are both so broad in scope that they don't really work well for this kind of thing.  Plus I'd really like to be able to have my own library on a pre-existing pattern site. 
If nothing currently exists, what's your most effective workflow for sourcing/posting patterns?  Any little known but pretty robust libraries I might be unaware of?  

Updates (most recent at top)
12/5/12 : Was able to get the Easel.io tool to work, but it's a bit difficult to select specific sections of a site instead of just the elements and their parents (i.e. in trying to grab a site's header and nav that are vertically-stacked siblings, you have to select them individually and manually move them into place within Easel).  I also had an issue where some inactive tabs were relying on their parent's background color (the elements themselves gradate from semi-transparent to fully-transparent to look sunken in), and for whatever reason even though the entire parent was selected, it did not bleed the parent background into the tabs. 

9/27/12 : Easel.io's Chrome extension (other browsers can use a bookmarklet provided by the site) is supposed to grab live elements on-the-fly to import into your projects on their site.  It doesn't currently create a repository of your imported/copied styles to organize into categories, just lumps them all into a "My Elements" section.  

3/27/12 : 
Patternry has started allowing HTML/CSS patterns.  Still doesn't allow you to "save" element styles from a browser extension, but at least gives you a place to store code snippets.  
Layout would be cleaner if they utilized something like embeddable jsFiddles and CSS3Please-esque mass vendor-prefix editing.  But it's a start.  

A:

I used LittleSnapper for Mac and you can easily categorized your images and you can make folders also.  
I used also different social bookmarking tools such as Zootool and Minus to share and organized screen capture images from the web. 