I'm an avid GMail user, but as someone that has several Macs and an iPhone, I've had my eye on the Mobile Me service for a while as it provides push syncing for mail, contacts, and calendar, as well as other services like Back to my Mac and Find my iPhone. The only sticking point for me is getting it to work well with GMail. I currently use Google Sync which works well enough on my iPhone, but does not work with my Mac.
The easiest option would be to forward my GMail to my Mobile Me account, but the downside is that any replies I send will have my @me.com return address instead of my @gmail.com address.
Any suggestions?