It seems there’s some mixed information about whether the wireless chip in this model works out-of-the-box with Ubuntu. I’ve tested with Karmic and the Lucid Beta (Netbook Remix versions) and for me it didn’t work. The chip in my model is the Atheros AR2427, which although not a new chip, seems to have an an unfamiliar hardware device ID of 002c, and so is not picked up by the ath9k wifi driver found in the kernel. The driver has been patched by the Linux Wireless developers but this patch has not worked its way into a kernel release yet, so the solution is to compile and install the latest bleeding edge wireless drivers, which is actually a pretty painless operation. It’s also a very safe operation, because the installer leaves the original kernel drivers intact and provides an uninstall script; but I have not needed to revert.
