I realise you don't support this driver but I'm not sure who to ask for help on this.
The Eee PC 901 comes with a ralink card. The supplied driver worked very badly for me and not at all with WPA, so I downloaded and compiled the official RT2860 driver, see here:http://www.itwriting.com/blog/778-fixin ... linux.html
As you'll see if you read the link, I can get either WPA working great, or WEP working great, but not both. It all depends on the setting for HAS_NATIVE_WPA_SUPPLICANT_SUPPORT. Just wondered if anyone had any ideas, or knew who I should ask.
I've also emailed FAE@ralinktech.com.tw