With Amazon and Google Scholar in the game, Citation Tracking is the new hot thing in web searching. Interesting to me because citation tracking, while a core strategy for all research, is often poorly supported in library designed systems. Is the web again pointing the way to true user focused design?
-an overview of Google Scholar and Amazon from Lorcan Dempsey's weblog
HubLog: TouchGraph browser for Google Scholar
This link was down last time I tried, but it is a tool for letting you graph linking between pages in Google Scholar
CiteULike Tracks Favorite Citations
I'm not sure about this one as it was a bear to set up on my computer and it doesn't do many sources. But the idea is very cool, you can marke an article you like and then get an alert if it is cited later.