I can't get google maps (Map.app) to work anymore either. It used to work fine, but after I unsucessfully updated my Touch to 1.1.2, and then as a result had to restore, and switch back to a jailbroken 1.1.1 state, Maps no longer works!!! I just tried deleting it, and then reinstalling it through the Installer.app, but still doesn't work. Is this a problem with the application, or is there something wrong with the server that the application accesses? Very odd...
Damn, you are right, Weather.app is not working either, very very weird. I also just tried You Tube for the hell of it (eventhough normally I never use it) and it also just keeps "loading" but nothing ever appears.
Maybe a new update is coming and they (apple) are doing some maintenance, or perhaps we are being forced to upgrade to 1.1.2 in order to get these apps to work? Hope all is well by morning.