It's really late, but I can't sleep and Ross asked for info about all the different beers. It turned into a review, so I thought I'd post it here.
Like in the US, there are a few major brewing companies. 4 to be exact. They are Kirin, Sapporo, Asahi, and Suntory. Most of their flagship beers are really good and pretty strong, ranging from about 5-6.5% on average. My favorite and most commonly on draft at restaurants is probably Kirin, and it's one I had back home as well. Typically because eating out in Japan is about serving each other before yourself, If you order a bottle of beer in a restaurant, you will get a giant bottle big enough to pour for three or four people.

What's really common in cans, however, is the Happoshu beers. These have lower malt percentages so they are technically not qualified to be considered beer according to the tax laws, and instead qualify as liquers or something like that. Because of this they are much, much cheaper at the conbini than all the other beers. Instead of 2.50 per can, you're paying only about half that. Because they are still stronger than American beers, I really have no problem drinking them. Lots of people who I've met are British, and apparently living anywhere in the UK makes you a beer snob, so a lot of these guys won't drink the happoshu. Asahi Clear and Kirin Nodaguchi are the best, though the one uses soy protein and the other uses liquer to up the alcohol content.
This next one, Yebisu, is one of my favorite beers because they serve it at the Gaijin bar here on draft. Remember, all the restaurants and bars really only have one draft beer-- but if they are really, really westernized, they may also have Guiness on tap too, but that's about it. I also like Yebisu because he's the god of fat people and fishing, and is the namesake for the character Ebisumaru (which as far as I can tell means circle-ebisu, or round-fisherman).
And of course, last but not least, there are microbrews. There are tons here, and most of them are sold by the bottle and have really flashy decals so that you pick them up and think, "wow this looks cool." If you ever get the chance to drink a Hitachino's Nest Beer, do it! It's made only about 15 minutes away from my place and is extremely popular with this area. I have had their Weizen, but at about 5-6 dollars a bottle it's not something I like to drink everyday. I've heard rumors of some places like ITap carrying their beers back home, and I'd be excited to see if it's true.


