The avatars have a limit of 100x100 already. The current disaster of huge avatars is due to the import. Apparently the check is done during the upload stage, and the import also apparently doesn't bother with the check. I may just nuke the avatars that are too large and just force people to reupload them. I will also be making an alternate theme for people that prefer the info on the left instead of verticle, but you're just going to have to wait until I get some time to do so. If any of the admins/mods wants to give a hand with nuking insane avatars, it would be appreciated. As mentioned, it's only current avatars from the import that will have this problem.
About the theme: Yeah, it's quite obviously not quite finished. Due to all the recent hacks of IPB I decided to make a lite version of my current development theme and proceed with the conversion. You'll also notice some graphics haven't been updated yet. It'll be finished soon, along with the obvious bugs in it.