One of my favorite download/web/technology blogs, Download Squad, has written about LinkBunch. Thanks, DS!
Download Squad also mentioned that a bookmarklet to create a bunch from open tabs would be nice. While a bookmarklet wouldn't be possible due to security issues, an extension is certainly possible.
While Googling, I came across another few sites writing about LinkBunch. Here's a bunch of those links ;) - http://linkbun.ch/6d