I love my T60. I just wish I had a Core 2 Duo chip inside instead of Core Duo. My motherboard is Rev 3 which means the backend is capable of running the Core 2. If this weren't under warranty, and this wasn't a company laptop, I would be buying a chip off eBay or NewEgg and swapping it myself. Reason? Bigger cache, and most importantly, native 64-bit support.
Noteworthy details about the R61/T61:
Available May 2007
Intel Core 2 Duo processor [T7100, T7300, T7500, and T7700]
Intel GM/PM965 chipset
Intel Wireless 4965AGN
Intel GMA X3100 IGP or NVidia for graphics
Intel TurboCard (Robson - basically built in flash usable for ReadyBoost!)
"IBM" logo absent from case.
IPS/Flexview will be phased out and/or unavailable.
Some people prefer ATI over Nvidia, especially after NVidia's Vista driver support.