Google released Mobile Sync for iPhone (and others) today. It's allows you to sync up to 5 calendars and contacts with your Google account and pushes it with MS Exchange. You have to turn the "Mail" feature off when you set this up, but maybe setting this up with Exchange is a sign of things to come. Hopefully Google is as tired as the rest of us with waiting for Apple to open it's push notification service.
I would much rather have a dedicated Gmail App instead of using Apple's Mail App, but push Gmail through Exchange would definitely hold me over.
