Paul Randal, wrote this article in the reference. I read it I think about 3-4 weeks back when a Microsoft consultant mailed me the link. It was really well written, I always have hard time explaining to people index fragmentation. The diagrams in these picture make that life alot easier :).
He talks about Data and Log Management, Index Fragmentation, Statistics, Corruption Detection, and Backups in article. A quick and easy read I thinks :).