The HDMI cable arrived today, so I hooked the EVO up to my TV and tried it...
I've seen some reports about the output looking a little grainy on the TV and I'd have to agree, but I don't think you can expect it to look better than what was taken with the phone. It's still HD and it looks great. I don't think you'll be making any apologies to your friends when they see themselves on TV from a video made with your phone, either. Instead, I think they'll be awestruck.
For those that haven't ordered the HDMI cable yet, the link that cary328is gave is the correct one. Here's the information from his post:
Arrow Electronics - North American Components (NAC)
Put part # 687860003 in the search box.
The cable is 6.56' long and costs $8.40 + shipping
There was some opposing views on the cable length, so I measured it and Cary was right on.