snatchula
IMO, a few every now and then (say, a few times a month) won't hold you back too much. But a few every night is excessive, and you should probably cut it out. It's not easy to turn down free beer though!
At the risk of revealing myself to be a Jillian Michaels fanboy, I was just reading about alcohol in her book
Master your Metabolism. It's mostly geared toward women trying to lose weight, but there's a lot of interesting info in there for guys too about how our environment and food choices affect our hormonal health. She lists alcohol as an "antinutrient", and is more strict about it than most trainers (did anyone see the way she blew up at Helen on last season's Biggest Loser for boozing it up on their one night away from the ranch? Oh my god, I thought she was going to have kittens.)
The good news for us guys, however, is that we handle all those detrimental effects only slightly better than women, and she acknowleges that red wine in moderation can reduce inflammation and promote health, etc. etc. (you've heard it all before).
BUT, she is quick to point out, the benefits pretty much max out at one drink a day.
Normally, when I'm going balls crazy with the exercise and dieting, I just naturally prefer to avoid alcohol, because it exhausts me and screws with my sleep. But just that bit about liver glycogen made me feel a lot better about skipping the sauce.