This should point you in the right direction.
Great, I'll have a play with that and see where I get. Thanks!
Can I ask what you intend to do if they have an LCD? The answer may shed some light on a possible solution.
Let them choose whether the display is stretched to fit the screen or run at the default resolution with a border when they're in fullscreen mode. I just haven't decided which I will default to yet.
Even casual gamers aren't that stupid! ;-)
If you've got a spare evening one day, I'll link you to the MSN Computer support chatroom I hang out in. It'll open your eyes to a whole world of stupid you never thought existed. And neither did I till I started hanging out there ;)