Whoops not Eric Thompson - he was the narrator on Magic Roundabout, I meant Eric Johnson. There is a video of him playing acoustic on his web site.

You could also try and get hold of an acoustic album of John McLaughlin/Al di Meola/Paco de Lucia which has some of the most astonishing acoustic playing that I have ever heard.

Definitely second Ry Cooder.

(As an aside, one of the great fun bits of music I enjoy every now and again is the guitar duel between Steve Vai and Ry Cooder at the end of the film 'Crossroads' with some incredible slide playing and all round fantastic musicianship ranging from heavy rock to classical via a touch of blues. Unfortunately from the point of view of this thread it's irrelevant as it's not acoustic!)