Hmmm...well there was a project a couple of years back for overclocking Intel IGP's....http://www.gmabooster.com/
Don't know if support was ever added for your part, you'll have to check and see. That would help the video a little, but you're still likely to be disappointed.
I would wait for the AMD E-450 (quad) to become available. That will likely be the first time we've ever seen a truly CPU capable netbook with moderate gaming chops. Even my OC'ed 1215N won't be able to keep up with that, and since the IGP will also be upgraded from the E-350, it's likely to be a real winner for AMD in the pockets of mobile gamers.