The Carnegie Hall website is offering free listening (and in some cases, free downloads) of new music commissioned by them. Visit http://www.carnegiehall.org/article/sound_insights/works/commissions/wrk_commissions.html to listen.
Maybe I’m prejudiced by being a clarinet player and all, but I highly recommend Gumboots for Clarinet and String Quartet by David Bruce, played on bass and Bb clarinet by Todd Palmer. I sure wish that piece was available for download. David Bruce talks about the piece on his website. This is one score I HAVE to have!
Five Chairs and One Table by Daniel Bernard Roumain is for (what sounds like) a wind octet, and has some really cool bassoon in it!
John Adams has a really good piece up called Son of Chamber Symphony. Not quite as captivating as The Chairman Dances: Foxtrot for Orchestra, but very powerful. I listened to it three times in a row, and found it better with each listen.