Here at TUAW on the tipline, we have heard no end of complaints about MobileMe. Some days, it seems like every other tip is about how much of a mess MobileMe email is. Which is probably why Apple is finally shutting the service down in a month or so, transitioning over to the new iCloud instead. But as TidBITS notes, MobileMe users will still be able to use their email addresses even after the service is gone: All you'll have to do is follow the instructions on the transitions page to set an option on the main site, and then you'll be able to keep accessing your MobileMe email even after the transition.
My advice? Unless you're thrilled with MobileMe, it's time to move on to one of the many great free email services, of which Gmail is my first recommendation. Yes, changing your email address is a pain, and there are probably some of you out there on so many lists and services that you'll stick with MobileMe as long as you can. But if you want my advice, use this opportunity to get out while you can. Good luck!