Mal, I know there was some discussion on this thread regarding the updating rate for the weather on the main page - well, it looks like the issue has been solved! Take a look at the following post:
http://forum.ppcgeeks.com/showthread.php?t=102962
I guess some simple reg-edits allow you to set the updating time scedule for the weather. I'm using 30min personally. Might be worth cooking into the next ROM update =)
UPDATE: Nvm, I see you already have it on the front page. One step ahead of me =P