Pubmed

[The Stranger]

The Web has bought us many things and many of those things have been trumpeted long and loud. Ironically, perhaps the most valuable site on the web (http://www.ncbi.nlm.nih.gov/pubmed/) is apparently largely unknown.
Bookmark it, you will need it one day

[chef]

never herd of it

[rachprice]

I prefer Ovid but yeah pubmed is ok...