IBM Thinkpad T61 RAM Replacement - iFixit Repair Guide
Tutorial: How to upgrade ram in a T61 Thinkpad - YouTube
8GB 2X4GB Compatible Memory for Lenovo Thinkpad T61 T61p DDR2 PC2-5300 SODIMM RAM (PARTS-QUICK Brand) at Amazon.com
Lenovo Thinkpad T61 RAM-Memory (2 Gig) | Replacement Part
4GB 2X2GB Memory RAM for Lenovo ThinkPad T Series T61 ( Type 7665 ) 200pin 667MHz PC2-5300 DDR2 SO-DIMM Black Diamond Memory Module Upgrade System Specific Memory - Newegg.com