Hey Scotty,
I'm having issues using MobileMe with apple tv. Its asking for my MobileMe account name and I have put in my my email. @ Mac and @ me etc. Am I missing something?
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Sounds like you are on the right track. However, your apple ID may not actually be your mobileme email address. One thing to consider would be to check within iTunes. Go to the iTunes store then check the top right hand corner to see what username you are logged in as.

If that doesn’t show you as bening logged in then click on “purchased music” in the left hand column of iTunes and then select one of the purchased songs. Next, get info on that song. You can right click or control click to do so. That information should show what ID it was purchased under. Now use that ID to log into AppleTV’s area.