Apple is taking MobileMe's web apps down for maintenance from 10pm to 12am PST tonight. MacRumors has heard this may just be to tweak the interface and add new functionality that:
will see the rolling out of several new enhancements, including an official launch of the redesigned Mail interface for MobileMe that has been available in beta form for the past month. Included in this rollout will be push functionality for the Web-based Mail client, providing real-time updating as messages arrive.
Apple is also reportedly removing the MobileMe "toolbar" for the various Web applications offered by the service, replacing the toolbar with a single "application switcher" icon that will allow users to switch between Web applications.
They've also heard a dedicated, universal iPhone and IPad app for Find My iPhone is on its way as well. That would be a first, since Apple hasn't so far updated any of their existing iPhone apps for iPad.
I guess we'll see come tomorrow.