The Lenovo ThinkPad T60p is the first ThinkPad to officially support GNU/Linux. Unfortunately that support is not quite as broad as some would like — you’re more or less forced to install and use SUSE Linux Enterprise Desktop 10 (SLED 10). The good news is, SLED 10 is a highly usable, stable, and configurable operating system. Officially you’re supposed to buy a support contract from Novell if you need help installing the operating system on a ThinkPad T60p, but if you’d prefer to do it on your own, this guide will walk you through the process.
There are many different T60p models and sub-models, all with very slightly different configurations. The models that support SUSE Linux Enterprise Desktop 10 are the 2007 and 2613, though as of this writing the only Linux-compatible models available for sale are the 2007-8ZU (14.1″ LCD) and the 2007-9ZU (15″ LCD). Realistically just about any T60p model (and probably most T60 models) should work, but I can’t guarantee that, so if you do not have an officially supported model, proceed at your own risk. At very least you should end up with a mostly functional operating system.