The Holmes Brothers-combination gospel and barband soul. Catch them live if you can (they are based in NYC), they are an awesome act. Their CDs tend to be a little too much gospel for me, though.
The Commitments movie soundtrack is great.
Buddy Guy-Damn Right I've Got The Blues (the album with an even better Mustang Sally)-is very good and very similar. All star supporting cast, like Eric Clapton, Mark Knopfler, etc.
If you want the real thing, pick up Roy Buchanan's anthology "Sweet Dreams."