Here are some websites which I find interesting/useful:
The Classics Library – infinitely useful teaching resources and discussion forums
Classics Confidential – news and interesting videos concerning the classical world (and run by one of my old lecturers)
A Don’s Life – Mary Beard’s commentary on ancient and modern
Perseus @ Tuft’s University – if you are a Classicist who has not discovered this site…WHERE HAVE YOU BEEN??
Bestiaria Latina Blog – takes the best of Classical blogging and puts it in daily updates with myths, fables, distichs and emblems as a specialty