I make all my movies in 640 x 480 res and that way they can be blown up to any res perfectly. The only problem is that JPGs can look crappy if they're optimized for 640 x 480 and you blow them up to 1024 x 768.
Then all you have to do is set the publish settings (dimensions) to 100% width and height and it works fine.
Please don't email or PM
me Flash questions, that's what the Forums are for!
Please don't rely on me reading my PMs either. Email me about important stuff.