I upgraded the Georgia Podcast Network from Drupal 4.7 to Drupal 5.5 tonight. I'm aware of a couple of minor CSS issues that popped up after the upgrade, but otherwise things seem to be working as they should be. If anything seems off, please send me an email at email@example.com.
There's not any new functionality except a nicer captcha and a couple of things under the hood. This is mainly to pave the way for things to come in the (hopefully) near future.