Well, you won't get to see it for a couple more months yet, but I'm really liking Shawn Wildermuth's ADO.NET book, from Addison-Wesley. Shawn breaks things down very well and tells a great story. I'm sure BobB's Essential ADO.NET will be good, too, but I'm not privy to an advance look at that one.
Chris You can read messages from the DOTNET archive, unsubscribe from DOTNET, or subscribe to other DevelopMentor lists at http://discuss.develop.com.