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For poker-savvy O8-beginners i think Tenner and Krieger have the best reputation, but i've only browsed that book in a bookstore.
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This book has a lot of good information. Unfortunately, it's not very well organized, and it's confusing if you've never played Omaha/8. I read it before I played my first hand and had trouble following many of the concepts (despite being experienced at other forms of poker). Then, after playing for a few weeks, I went back and read it again. I got much more out of it during the second reading. Still, I recommend you buy this book if you're interested in the game.
There's really no book like Winning Low Limit Hold'em for Omaha/8. Someone needs to write one for beginners telling them basically which starting hands to play and how to play various made hands and draws.
You might want to check out these two web sites:
http://www.winningonlinepoker.com/
http://www.playwinningpoker.com/
You'll also want to pick up Zee's High-Low-Split Poker book if you're serious about the game.