[Moneyline]

IMO the 4 best O8 books are:

1) Super System 2
2) High Low Split Poker For Advanced Players
3) How To Win at Omaha High Low Poker by Mike Cappelletti
4) Omaha High-Low by Bill Boston

Hellmuth's book is good for beginners, the Tenner/Krieger book and Ken Warren's book are awful IMO...