Eigenfactor is very cool (as is Carl) and allows you to do stuff like this http://plindenbaum.blogspot.com/2008/06/pubmed-impact-factors-sorting-and.html http:

Eigenfactor is very cool (as is Carl) and allows you to do stuff like this http://plindenbaum.blogspot.com/2008/06/pubmed-impact-factors-sorting-and.html http://plindenbaum.blogspot.com/2008/06/pubmed-impact-factor... Wish it were more mainstream since there are a lot of interesting possibilities.