ThinkPad 11a/b/g Wireless LAN Mini Express Adapter
IBM Option PN (US): 40Y7026
Linux WiFi driver
Try the Madwifi driver.
get the driver from http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-52527 and use ndiswrapper
Some ThinkPads have a hardware switch that must be in the on position for the radio to work, regardless of driver state:
(Note: This may not always be the case. On at least one T60, model 2007-62U with Atheros AR5212, running Ubuntu Edgy with the MadWifi driver, the wireless switch has no effect. Wireless operates with the switch in either position. But there's a experimental patch which adds support of the switch to ibm-acpi.)