vadlo (
www.vadlo.com) - great search engine and borwser for biology
methods and databases. you can search powerpoints too. I think the
collection of techniques that vadlo has is bigger than any other
lists
on internet. cell and developmental biology or organisms such as
mouse, xenopus, zebrafish, yeast, drosophila are very widely covered.
But the best thing I believe is so many journal cartoons!