For the most part, unfortunately, AD/SS is a dish best served non-canon (DH revealed some asshole tendencies on Dumbledore's part, no?)
My other favorite ships include Snape/Argus and Snape/James. Then comes Snape/Sirius, then Snape/Lupin. A little less than that, but still loved by me are Snape/Slughorn, Snape/Hagrid, Snape/Lucius (NICE Lucius, not bastard Lucius!), and much more.
As far as pairings I've been writing, I think I'm really becoming fond of James/Snape/Sirius (and Lily too but in one of the parts I haven't yet written).