Apple just sent out an email to MobileMe subscribers to let them know of some new(ish) features. The biggest bullet point is the fact that push 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. To take advantage of faster syncing, be sure you're running Mac OS X Leopard 10.5.6 (Mac) or MobileMe Control Panel 1.3 (Windows).
After a lousy launch in 2008, Apple decided to avoid associating the word "push" with Mobile Me until they could get synchronization between computers and mobile devices (iPhones, iPod touch) down to acceptable times. Looks like it's close enough now to bring the term back.