The pizza tapes

Don't think it is completely acoustic, but I have been enjoying Hope Waits cd VERY much lately. Kind of hard to find, but available on amazon

Try Common Chord also w Grisman and a great violinist whose name escapes me at the moment.

I just picked this up, and can definitely recommend it, Jerry Garcia and John Kahn, acoustic, from 1986:

http://www.dead.net/features/release-info/jerrys-back-and-weve-got-him

second the garcia/kahn rec.

Garcia/Grisman-Shady Grove
John Renbourn/Stefan Grossman
Pentangle-Jack Orion
Kronos Quartet-Early Music
Norman Blake-From There to Here

Old & in the Way - Garcia & Grisman
Old & In the Gray - Grisman & Rowan

Bill Staines - First Million Miles Vols. 1 & 2

Eliza Gilkyson - Your Town Tonight

get some of Hot Tuna's acoustic stuff

a couple we're enjoying this evening....Grisman/Tony Rice, Tone Poems

Jorma Kaukonen, Quah

Thanks for all the responses, I am looking into them, and I am not only looking for bluegrassy stuff, but more to do with the intimacy and acousticness of the album, and yes I make up words all the time.

Shady Grove..........Buy it, enjoy it,... then love it, and smile. Pure Jerry.....perfect !!

try some:
LAURENCE JUBAR. guy is amazing ,IMO
http://www.youtube.com/results?search_type=&search_query=laurence+jubar&aq=f

BERT JANSCH