Star Trek is famous for slash. There are a lot of ST books with a Kirk/Spock pairing. Harry Potter is going the same way these days.
Just go down to the Scusa thread at
Fictionalley Park and take your pick. You have normal pairings, slash and even incest! Adding to the pot-pourri are cross-generational pairings. Sometimes, it totally squicks me.
My favourite pairing so far has been Harry/Ginny followed by Ron/Hermione. Remus/Sirius may be slashy, but it just seems like a cute pairing. Dunno why. hehehe