Get Company of Heroes!!!
You might not be able to play it on high resolution, but it's still totally worth it! I have a Dell XPS Gen2, with a centrino CPU, 6800Ultra laptop version and 1 Gb ram... It plays nice and smooth @ 1024x768. You get a better experience then you'd think, especially since the gameplay of CoH is so awesome. Get into multiplayer and you won't be able to stop. :hap2:
I usually play it on my 24" monitor @ 1920x1200 though, and ohboyisitamazing! :clap:
Also, another thing that will make you happy is upgrading your graphics card. For $200-300 you can get a DX10 card that will make your games melt like butter. Spend a little more and you'll find yourself with a gigantic 8800 GTX (although the 8800Ultra is $800+... what a joke!)