Psyringe: Which games are we talking about, and what's the resolution of your screen?
DOSBox and ScummVM games can be adapted to any screen size, but you probably know that already.
Modern games should have options to adjust the screen size.
For other games, DxWnd might be useful, though you'll see the window borders and title bar when you use it. There's another tool which allows to force games into borderless windowed mode, but the name eludes me at the moment.
Personally, I can access scaling option in the nVidia driver, but it seems from your description that the Intel driver isn't as sophisticated.
My resolution is 1366 x 768. But I want to play in a lower resolution and not see black bars on each side. The games are Team Fortress 2, Fallout 2, Primal Carnage Beta and more.
langurmonkey: I want to make it so resolutions lower than my native resolution get stretched out to fill the screen when I play games.
mistermumbles: Frankly, I don't even understand why anyone would want that to happen. Stretched graphics always look hideous.
I like the way they look.