Oh Yes, I have been an addict to:
www.allmusic.com - The All Media guys are doing a great job although I personally liked the vintage faster / simplier design more, but the library is really excessive and it makes sense to read even about well known acts as far as you get lots of background info about the particular artist / band that will give you a better feel for their work
www.imdb.com - there are always new or rare or forgotten movies to explore, like to browse by director or actor / writer and then set my own lists what to check out (although many titles are quite hard to get)
Sometimes, I can spend hours reading surfing and reading these sites. I even thought of applying for the non US based writer for Allmusic.