I'm not sure anyone in the world has sampled more brews than Michael Jackson. No, not that Michael Jackson. This one is (from what I've been able to discern) the pre-eminent beer critic in the world.
"Great Beer Guide" covers several hundred beers from all over the world but avoids the "x number of stars" format and, in fact, doesn't offer a numerical rating at all. It's assumed that if the beer was good enough to make it into this guide that it qualifies at the top of it's class, whether it be a pilsner, lager, or ale, or even one of the exotics like a lambic or barleywine.
The biggest draw of this book for me was the layout. Each of the 500+ pages is occupied by a single beer, which is pictured in both it's bottle incarnation and also as a draft, giving you not just an idea of what the beer looks like but also the official glassware it's intended to be served in. Some of the more unusual glassware includes a beer from Oregon that is served in a pint glass with a half-log as it's base!
In addition to the pictures the text also tells you what type of beer it is, where it's from, the alcohol content by both volume and gravity, and finally a description of the beer itself (again, there is no effort made to play favorites, but if the description sounds up your alley it would be more than worth your time to track the beer down).
Alas, many of the beers listed in the book have limited distribution, so depending on where you live you'll probably only have access to a reasonably small percentage of these brews. Nonetheless, I was able to track down quite a few by special order that the local liquor stores would probably have never stocked of their own accord. And who knows? If you find yourself doing a lot of travelling you might just manage to cross all of these off your list sooner or later. But I doubt it.