sd_recs just posted a wing!fic recs (http://sd-recs.livejournal.com/7300.html) entry. I haven't gone through them all and I honestly don't remember most of the wing!fic I have read, so I don't know who is winged in the fics recommended.

I recommend maygra's Reaper Series (http://assignations.org/spn/) which has winged!Sam. It starts off with Reap the Wild Wind (http://chaikhana.net/spn/reap.html).

I also highly recommend Airborne (http://insane-songbird.livejournal.com/167212.html) although it's winged!Jensen.

J2 as spies (http://delicious.com/electricmonk/theme%3Aspies) (I'm sorry, but I don't keep track of who bottoms.)

detective!jensen (http://delicious.com/electricmonk/profession%3Adetective!jensen)

Do I Seem Bulletproof To You? (http://fleshflutter.livejournal.com/43577.html) - probably the best prostitute!jensen fic out there (bottom!jensen). Also, Something Borrowed, Something Blue (http://belyste.livejournal.com/19534.html).