Stormwind Rep

Or you could turn in vast seas of runecloth. Don't care to think how much runecloth I've spent on Darnassas rep, and I still don't have my kitty.

Have you done all of the Darnassus quests? Quests are by far the easiest way to get rep, now. Just go back and do all of the lowbie quests you never did. After that, PVPing is the best way to get rep, unless you want to spend an ungodly amount of time or money farming runecloth.