I liked "Idiot's Guide to Yoga", and you can probably find more suggestions for recommended reading, there.
Otherwise, I'm sure someone will post soon with more information. ^-^ You can also search for yoga threads here, as it's talked about a lot.
I really like classes, myself, and have been going to classes off and on (mostly on) for about a year now. It's a little like therapy, for me. I especially like being walked through meditation, I'm lucky in that I've had teachers that are very good at that.