Great advice, guys. I blew through 38 and haven't even turned in all of my quests (my netherweave bags were full, so I am currently resting in the AH) and am a little over 25% through level 39. I'll continue the grind tonight and hope to be doing my mount quest late tonight!
Also, FYI, I've been reading threads about spell rotation, and was curious: now that my
Gravestone Scepter is starting to lose its bite, I've been throwing in a Shadow Bolt after Immolate, Curse of Agony, Corruption and Siphon Life (in that order) and have noticed a nice hit (especially if I'm in Shadowtrance at the time) increase, at the cost of mana. I'll soul drain if I need a shard or life tap if I've drawn aggro on an enemy with a significant amount of HP left.
How am I doing?