Here are the recommended specs for a couple of upcoming 2011 games (obviously these are entirely different engines, so not sure exactly how relevant the specs would be).
Dragon Age 2 - March 2011 (recommended specs)
CPU: Intel Quad Core 2.4 GHz Processor or equivalent
CPU: AMD Phenom II X3 Triple core 2.8 GHz or equivalent
RAM: 2GB (4 GB Vista and Windows 7)
Video: ATI 3850 512 MB or greater
Video: NVIDIA 8800GTS 512 MB or greater
DirectX 11: ATI 5850 or greater
DirectX 11: NVIDIA 460 or greater
The Witcher 2 - May 2011 (minimum specs)
----- Processor: Intel Core 2 Duo 2.2 GHz or similar AMD
----- Memory: 1 GB for XP / 2 GB for Vista
----- Graphics: Nvidia GF 8800 512 VR or similar AMD
----- Hard Drive: 8GB for game and 8GB bonus content
also, if it is within your budget, and you want to reduce your load times significantly, an SSD or hybrid drive can help. I don't think an SSD will help your gameplay; however, other than reducing interior/exterior loads and save game loads to almost nothing.
Never use laptops for gaming purposes (unless it's really low recommendations like WoW or something). Take the specs and cut the performance in half, and that's what you'll get. Throw in awful heat dissipation and you've got a laptop that'll cook itself (and sterilize you if you dare put it on your actual lap).
There are a few laptops that can deliver great frame rates with about any recent game other than Crysis at 1920x1080, all detail settings maxed. Most of them are giant lego block/spaceship looking behemoths that are really heavy to lug around, but a bit more convenient than a desktop. The Envy 15 (which has been discontinued but is still available refurb/ebay/etc.) is the only one that is actually portable (1.04" thick), and is available with such options as 4 DIMM slots for up to 16GB RAM, USB 3.0.
This is an excellent laptop, but if you buy one refurb or used make sure to get some sort of return policy in case you get a defective unit. I'm very happy with mine and I can usually overclock the Mobility Radeon 5830 to 550 MHz / 1100 MHz resulting in decent frame rates (at least 40-60 fps and often higher than 60fps) for games like Civ5, New Vegas, FO3, DAO, RE5, Bioshock2, The Witcher, Prototype at 1920x1080, all detail settings maxed. Vanilla Oblivion runs at constant 60 fps with vsync enabled. After installing over 100 mod files including QTP3 HD textures, OBGEv2 and ENBSeries shaders the frame rate is significantly lower, around 45-50 fps.
The battery life is terrible but you can get a very thin slice battery that triples the battery life. The case is made out of metal alloy and the bottom gets very hot when plugged in and running any intensive application. You would want to use a laptop cooler when gaming or performing video editing or other intensive tasks. The Mobility 5830 GPU, together with the Mobility 5850 and Mobility 5870, are all made from the same die as the desktop 5770.