Since you're enjoying HORSE, I thought I'd recommend a couple of books. You've probably already heard of these from 2+2, but on the off chance that others here are interested...

HORSE is a game that stands for

Holdem
Omaha/8 (a high/low split with an 8-low qualifier)
Razz (7-Stud played for low)
7-Stud (high only)
Eight-or-Better (high/low split 7-stud with an 8-low qualifier)

The game is played in rotation, with one "round" of each game. In a 10-handed game, there are 10 hands dealt of each game, then the next game is played, etc. HORSE rewards the all-round player, rather than the single-game specialist. In fact, a single-game expert might be a net loser in these "mixed games" if he isn't close to break-even in his non-specialty games. The fish like HORSE because its more like playing in a home game with all the variety. The really big games (like the big $4000/$8000 game at the Bellagio) are usually played as some kind of mixed game, from what I understand.

You may want to pick up "High/Low Split Poker for Advanced Players" by Ray Zee. It covers both High/Low 7-Stud and Omaha/8.

You're definitely right about people not understanding even the basics of Razz. The best thing in print on Razz, by the way, is the second half of "Sklansky on Poker", which is devoted to Razz.

The one game that some HORSE players seem to play fairly well (besides Holdem) is 7-Stud. I think this is because it's an old game and was pretty popular before the NL Holdem craze. Sklansky, Malmouth & Zee's "7-Card Stud for Advanced Players" is a great book for this game. I enjoy stud, but I find it nearly impossible to track the dead cards and multi-table. Mason Malmouth has said that while he finds Holdem to be the most complex poker form, Stud is more fatiguing for him to play because of the need to memorize all those dead cards and adjust drawing odds appropriately.

Ed Miller is working on a Small Stakes NL Holdem book. I can't wait until that comes out!

Jim