Google launched a tool called Notebook last year which is similar to a scaled-down web-enabled version of Microsoft OneNote, less the ink.
If you are looking for a quick, free, and useful tool to track notes from a browser, this is it.
http://googleblog.blogspot.com/2006/05/note-this.html
If you're looking for the best tool to track notes, journal your day, research & documentation from your desktop then get Microsoft OneNote.
