I would say, do the following:

1. Make a "lite" HTML version of the site which loads more quickly and doesn't have as many images/ bloat on - make it use CSS properly etc and be as minimal as possible. This would be really good. [replace graphical buttons with text ones, don't show avatars. Display antipoints indication as text instead of green blobs]
Don't use spacer images, don't use deprecated elements like font, and pay no attention to old non-standards compliant browsers.

2. Reinstate the javascript "you have new PMs" popup on the front screen. But take care that it only appears once each time you get new PMs

3. The antipoints system is pretty much ok as far as i can tell, it could be better but I'm not sure how.