Thanks Randy, I probably have the TV working now though. I was having trouble getting the resolution, refresh, and mame flags set up correctly to display the picture right on my TV with Component output through an ATI HDTV adapter.
I think my final problem was with the switchres flag. I'm still not positive I'm getting the best picture I can, so I'll probably be back with more questions, but I am able to play games now.
I haven't dealt with the new component stuff very much, but I'm going to venture a guess that you would only be able to do normal TV resolutions or whatever resolutions the card supports in that frequency range. This would probably mean 640x480 and 720x480. The higher ones would have to be interpolated but the card may not support that using those outputs.
But in the end, you'll be limited to finding a resoluton the TV is stable at, locking the software at that resolution (no auto-switch) and use hardware stretching to fill the screen.
Oh, and the Keywiz is working good. I hooked up one of my p360s right away on some scrap wood. I don't have any buttons, but I'm using my stick!
Cool.

And Snaaake.....
In one breath you state that TV looks great on an arcade monitor, but watching it there is "the weirdest thing ever". You don't get out much, do you?

Watching TV on a cab is no different than using a cab for a jukebox, which I am sure that many people do. If you don't have the space, or the money to duplicate all the goodies you put in that box you call an arcade machine, you might as well get some use out of it when no-one is playing. Don't be so judgemental!

RandyT