Huh, I was just looking for something like that: a webapp to squirrel interesting links that might sooner or later prove useful as sources and references for blogging, tweeting, and similar purposes. Big thumbs up!
As for more suggestions, a pretty obvious one is a browser plugin. While bookmarklet is nice, a plugin would likely allow to offer more features (like list of recently added links as popup menu, search mechanism, etc.). I guess it's not hard to turn bookmarklet into Chrome plugin, but please don't forget about Firefox users too :)