In no special order :
...
Fantas_Magoria . Slowly working it's way through every BtVS episode and now up to Season Three, you can find icons, essays, fictions, all sorts of interesting tidbits.
Buffy Questions . Opening in late 2009 but already coming up with puzzlers that give you something to think about and/or research.
Gen_Storyteller . The best source for people looking for non-shippy tales with 245 tages so if you're looking for a particular character - look no further.
Open_On_Sunday . Created in 2003 and still going strong. The best place IMO to find amazing drabbles based on a weekly word prompt.
The_Sunnydale_Herald. Created in 2004 and still the place to check to see what's new and exciting. Unlike paper newspapers, this one keeps going with daily fresh news and links.