Precambrian
http://faculty.weber.edu/bdattilo/fossils/notes/precamb.html
Cambrian
http://www.ucmp.berkeley.edu/cambrian/camb.html
There is a dude I know who has posted a lot of great links on Evolution and science and the issues with IDers and Creationist.
http://www.freerepublic.com/~patrickhenry/#List-O-Links
Hope it helps
hawk