Paul S. Randal is the definitive source on Database Corruption and recovering corrupt databases. Check him out at http://www.sqlskills.com/BLOGS/PAUL/category/CHECKDB-From-Every-Angle.aspx He wrote DBCC CHECKDB for Mircosoft. A lot of things in this article and a whole lot more is in his site....
"Technology is a weird thing. It brings you great gifts with one hand, and it stabs you in the back with the other. ...:-D"