Although those Dell cards are Airport devices, I believe that Thinkpads only accept a certain few PCIE cards. I might be wrong about the Dell cards, but you would be safer buying one of the Atheros Thinkpad cards (which can also work with Airport, with a tiny edit of a plist). I got a 11a/b/g card (#40Y7026) off of ebay for around $20 to put in my T61. As Gurruwiwi said the installation is pretty easy -- there is even a step-by-step guide on the Lenovo site.