I highly recommend a very readable book by David Jennings called Net, Blogs and Rock 'n' Roll. It is a look at how people use the Internet to listen to music, to find new music and to make new friends.
Andy, my husband/partner/spouse, gets a mention several times including a chapter that begins with his name. I'm feeling warm from all that glory. Seriously, he should be proud of what he has done over the years, I know that I am. David has posted this rather wonderful post profiling Andy and A Head Full of Wishes.