I just logged into my google mail for my domain, and the UI was pretty bad.

I looked at the URL and there was a new variable. interestingly enough it was called ui. It seems they are testing something... I tried it in Gmail and it did not work... so if you have google apps... give it a try :

mail.google.com/a/YOURDOMAIN/? ...
mail.google.com/a/YOURDOMAIN/? ...

ui=1 is the old gmail theme
ui=2 is the new gmail theme with spacing and such messed up
ui=anything_else or omit ui is the new gmail theme

Not seeing it, screenshot?

Just does the same as clicking Newer Version or Older Version at the top right.

I'm not seeing it here either.

ui=1 is the old interface
ui=2 is the new interface with the newer default theme