Comment 36 for bug 521967

This is solved in Linux kernel 2.6.34. I don't know if the patch ever made into 2.6.33.x, but I think it didn't. Anyway, checking the changelog at kernel.org will answer that question for you. I wrote a simple howto in the past regarding this issue, it might help you, even if I've heard of some people to whom this solution didn't work:
http://mindboosternoori.blogspot.com/2010/03/howto-have-wireless-working-on-asus-eee.html

Anyway, any Ubuntu kernel >= 2.6.34 should make this work. Take into account that Maverik (Ubuntu 10.10) is planned to be released with 2.6.35.

Just saw that a 2.6.34 built by Ubuntu's kernel team is available here: http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.34-lucid/