I've also been having problems with my netbook freezing on just about every Ubuntu edition. The problem seems to lie for the open-source driver for the BCM4313 wireless module. Of course there are actually two version of this netbook in the wild; some have the Broadcom wireless chipset, while others have an Atheros chipset.

Anyway I have sort of solved my issue by installing mint 10 and using the proprietary broadcom wireless driver. It's kind of slack that the open source wireless driver has been causing these freezing issues on 3 successive Ubuntu releases.