The Music Maker Relief foundation is a really cool project. There offices aren't to far from where I live. I have a few of their cds and they try and capture the raw blues sound and do it very well. A lot of their offerings are acoustic blues. Some that I have and could recommend:
Lightin' Wells - Ragged But Right - Wells plays in the Piedmont blues style of Rev. Gary Davis. He plays a lot locally, excellent guitarist.
John Dee Holman - Bull Durham Blues - Mostly John playing and singing solo. John's from Chapel Hill and plays a lot at local festivals. Taj Mahal plays on one track.
Guitar Gabrial - Volume 1 - More old school blues. Unfortunately, Gabrial died a few years ago.
Cool John Furgeson - self titled - This one is the an exception to the acoustic blues flavor of most of the Music Maker artist. You'll hear a lot of Hendrix in his playing. He plays nearly every weekend somewhere in Durham and he can smoke a guitar. His live performances blow me away.
This is a great foundation and Tim Duffy is a great guy. I would encourage everyone to support his cause and buy a few cds.