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Go to my blog and check out some of my Album Reviews and "Song of the Day" articles. While mostly are rock/metal I have been trying to cover numerous different styles, from very heavy prog/death to moody, haunting rock with lots of acoustic work.
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If you like acoustic stuff check out the album Presto by Rush. It has a lot of acoustic type stuff on it. The song "Presto" is timeless. They have some amazing classical guitar work on their older stuff such as "A Farewell to Kings", "The Trees", and "La Villa Strangiato". And I cannot overemphasize how amazing the song "Different Strings" is.
Opeth's newest album Damnation is a weird one. Coming from a very heavy progressive/death metal band, this album is very nearly all acoustic, and all mellow. It is wonderful. Opeth also has a lot of great acoustic work on their heavier albums as well. Check out the final track on Morningrise "To Bid you Farewell". It is so beautiful it almost makes me cry.
Oh, check out the album Office of Strategic Influence by O.S.I.! It rocks, is moody and atmospheric, and extremely good work. Some fast rockers, some slow acoustic stuff, and the song "sHutdown" which may very possibly be one of the coolest songs ever.
The live album 12:5 by Pain of Salvation is wonderful. It is basically an unplugged album, with some new material. And it is a real work of art from an astounding progressive band.
Hope those are some new tunes for you to check out. If anything I wrote about sounds intriguing let me know and I will make some more recommendations or point you in the right direction to hear some of this music.