Recommended sites that are... kinda awesome!
Critically Touched: Angel - I obviously have to plug the spin-off show! These reviews were written by Ryan until he bowed out, and members of the Critically Touched community took over for him. You'll find a great variety of opinions there in the last couple seasons.
Buffyverse Dialogue Database - This site has full episode quotes for every single Buffy and Angel episode. You can even search for specifics words or lines! Nearly all of the quotes that appear on reviews are grabbed from there.
Whedonesque - The the #1 site for keeping up with all things Joss Whedon. I pop in over there fairly regularly.
Upside Down and Halfway to Happyland - A fun and spirited podcast where Kim (a.k.a. AthenaMuze) brings in guests to discuss various aspects of Buffy. I have been mentioned in it several times, and have been known to do a guest spot from time-to-time.
Slayage: Online Journal of Buffy Studies - A huge database of articles, essays, theses, books, and other academic material related to the Buffyverse and other Joss Whedon works. A really neat resource, if you're in an academic mood.