Juice - The intelligent discovery engine from Linkool Labs (Available as Firefox plugin)
We've all been there. You started reading something on the Web, saw something interesting in the article, searched for it, wound up somewhere else, and after about 12 hops you've forgotten exactly what it was you were looking for. If only there were some way to select that topic midstream and have the information automatically appear for you, without disrupting your workflow or sending you traipsing off into the wilds of the Web.