You can try add ram to it for gaming, i think 1GB DDR2 ram can be fine with Carbon

. If can let it be 2GB DDR2 ram and dump the GMA's memory to 224MB . I think the resolution can make it 800x600 with 2/3 detail . Motion Blur keep it off, Antialixx and texture firteling keep off, shader detail keep low. will be fine at all.
I just brought a Compaq V3222 yesterday with this spec:
AMD Turion 64 x 2 TL-50 (1.6Ghz 256KB+256KB L2Cache)
nVidia nForce MC430 Chipset with nVidia geForce Go6150
nVidia Go6150 up-to 256MB TurboCache (Shared)
1GB DDR2 667Mhz Ram (Before was 512MB)
80GB SATA
14.1 WXGA 1280x800
I can run NFS:Carbon at 800x600 with motion blur on, it running smooth without any lagg!
All detail= High , shader detail = low, Texture Filtering = Anistropic, World Detail = Low , Road Detail = Medium, Car Detail= High, Car reflection update= Medium
The Sims 2 Open For Business , like what Goldfries say, it running smooth ! I use 1280x800 with all medium detail. Most important is, pls adjust at graphic control panel for texture filtering and antialeasing set to OFF. Default was "Application Prefrence".
I get shocked after i play games! BTW it just a integrated graphic, so don't compare with dedicated graphic. It's enough for normal user

. Even my iMac 2.0 Core 2 Duo with ATi X1600 i feel lag when i put the shader detail to high for NFS Carbon.