Ugh, IBM used THAT wireless card - I have burnt through three or four of them in a different model ThinkPad laptop. Total POS, supports WEP only, (WPA TKIP if you spend hours screwing about with the firmware while pulling your hair out).
An older Intel 2200BG* would do the job (but its BG only), not sure if a newer N type card would even fit, yours has a Type III slot.
*If you are replacing an existing card you will loose the modem feature (and fax). If you never had a wireless card, a separate modem is installed elsewhere on the mainboard. In addition if it was a wireless ready model, the antenna leads are already there for you to connect. If it wasn't a wireless ready model you would have to and antennas, this requires taking the laptop apart.
Cheapest way might be via a N USB adaptor.