These are a few stories out on the web I think are worth the google search.
Snape/Harry Slash (NC 17)
The Home Fries Nazi by pir8fancier
Whispers in Corners by esama
Harry/Severus Slash (NC 17)
In Perpetuity by starcrossedgirl
Harry/Severus Slash (NC17)
Love Song of Bastard and Idiot by Predatrix
Harry/Draco Slash M/M Adult
Tissue of Silver by Fearless Diva
Gen with a vampire twist. A very odd, interesting tale on ffnet.
Straight on Till Evening
HP/HG Het T-Rating
Courting Hermione Granger by Keira Marcos
My favorite stories list are unfinished stories I am either following or one day may read again. My community holds all the finished stories I think are worth a read.