Recently we changed from a dark grey to a textured black background. But the backgrounds of our icons aren't transparent! This causes problems with the new background... see on the right-hand sidebar:

http://mediagoblin.org/blog_images/mediagoblin_0.0.4_mouse_tags.png

For the log in and registration forms, the labels should go in the fields to make it more quickly recognizable. Check this jQuery plugin: http://fuelyourcoding.com/scripts/infield/

Confirming a password is really cumbersome and not helpful. Remove the »confirm password« field in favor of a »show password« checkbox.

For reference, see Jakob Nielsen on the topic http://www.useit.com/alertbox/passwords.html