2GB Memory RAM Upgrade for the Lenovo Thinkpad R61 Series, T60 Series, T61 Series, X60 Series and X61 Series Laptops (DDR2-667, PC2-5300, SODIMM) at Amazon.com
T61 - Wiki
Change RAM in Lenovo T61 in one minute - YouTube
IBM Thinkpad T61 RAM Replacement - iFixit Repair Guide
LENOVO THINKPAD T61. core2, 160gb hdd, 3gb ram, 2.20GHz, win.7-7. for Sale in Raleigh, NC - OfferUp