Rory Block is an utterly amazing guitar player. She's won the W.C. Handy Award for her great album, "When a Woman gets the Blues". I've seen her play live and she is incredible!
I'd second (third?) Ry Cooder...do like "Meeting.." My copy is recorded without much gain so I always end up having to crank up the system which also ups the background noise in the quiet passages. Great performance though. Also enjoy the soundtrack to Paris, Texas, though much slower paced and medatative than "Meeting".
An INCREDIBLE improvisational jazz guitar recording: Marc Ducret, "Detail" (recently on the "Recordings to Die for" in Stereophile). Fantastic recording, great performance!
On a more folksy note: Deb Talan, "Something Burning" ...again, great acoustic performance and well-recorded. Wonderful CD as is her other album, "Sincerely" Not as well-known, but worth looking for.