A few useful references:
Tet Zoo - Tetrapod Zoology blog. Always something of interest. Somewhat skewed to dinosaurs?
Palaeos - A very good reference for cladograms and geological times
Paleo news - A reasonable summary of recent news, generally stuff that's broken through to mainstream media.
StephenJayGould.org - an "unofficial archive"
Paleoring - for a bit of a trawl