A quick note about a really cool tool that one of my labmates just told me about: Zotero.

It's a Firefox plug-in that allows you to save papers that you find on Google Scholar, Citeseer, etc., and attach notes to it, etc. Afterwards, you can go back to these saved papers and download the paper or the bibtex file. I can't believe I'd never heard of it before! Also available for download from the firefox plug-in site.