Without hijacking the thread, I am using the default calendar app, and I need to switch the account it was linked when I first got the phone. I can't figure out how to switch the primary account. Thanks!

 

The EVO will sync each and every Google calendar that you wish to create. Anyone who stated that it only syncs the primary calendar is simply wrong.

Factory reset. AFAIK that's the only way.

 

Thanks! That's a pretty bad way of doing this

 

I don't disagree, but doing a factory reset isn't as painful as you might think. All your Google data (mail, calendar, contacts) re-sync painlessly. The Android Market remembers which apps you've downloaded, and should prompt you to reinstall them (don't know how this works with paid apps). Anything on your sd card is untouched. So really, the only things you lose when you factory reset is (a) your SMS/MMS inbox, and (b) your call log. Both of these can be backed up by apps in the Market.