After a 2008 launch that underwhelmed just about everybody, Apple's MobileMe has announced that, among other enhancements, the push functionality is back.
"Faster syncing with Mac and PC. Changes you make to contacts and
calendars on your Mac (Address Book and iCal) or PC (Microsoft Outlook)
are now automatically pushed up to the cloud every time you make an
update. Likewise, changes you make on me.com, iPhone, or iPod touch are
automatically pushed to your Mac or PC. As a result, your contacts and
calendars update faster across all your devices."
In all honesty, "push" never went away — but Apple stopped using the P-word until they could get synch between computers and mobile devices down to acceptable times.
Other features include iDisk file sharing and better web app performance.