* Heat management: Thinkpads just don't heat up in harmful ways. I have seen way too many Macbooks that can't be handled when they heat up or the continued stress degrades some component * Keyboard with a Delete key * You can install Linux on a Thinkpad trivially and have it ready for use. The MBP just isn't there * The chassis stands up to a lot more abuse, not just aesthetically (because the MBP frames scratch up just by looking at them the wrong way) but in terms of actually resisting falls. * With the newer models you can replace the external battery while running, and if you get the larger batteries you can run your machine for a full 24 hours.