I was writing about the forums in particular (I don't think I made that clear enough), not the WP application interface. Otherwise, yes, as angry anon nutbag pointed out it is very easy to change. I thought angry anon nutbag was suggesting I create my own stylesheet to override Georgia in the forums, which seemed a little extreme. Then I realized he just thought I was some kind of CSS jerk, and that I deserved his wrath for "complaining about something completely asinine", and wasting everyone's time.
To be honest it It's just something about the format of this forum which makes Georgia feel more like a mean old communist Georgia, and less like a relaxed, free market, Ray Charles kind of Georgia. I think it was just a fridge to far, seeing the date stamp in Georgia. Maybe it is possible to have too much of a good thing? Note: there is a touch of sans-serif at the bottom of the page ("code is poetry...") It's striking because it is the only place it is used.
Re: login to post, Yes. Cut down on the noise *and* make threads easier to follow. On some of the deeper threads it becomes really difficult to follow who has posted what, and the communication breaks down. All in favor of a more restrained use of Georgia and login to post say "nutbag".