- Nub pointer? I love it. Full mouse control without moving my hands significantly away from where they were on the keyboard anyways. My X220 has a trackpad, but I only use it by accident.
- An LED that lives above the monitor and has a shield that points it down to light up the keyboard. This is a lifesaver on long flights.
- Docking stations. I've got two USB drives, a pair of headphones, a few USB-powered accessories, two monitors, a mouse, and a keyboard plugged into my computer when it's at the office. My MBP-toting coworkers have to connect and disconnect all that when they pick up their computer; I press the big undock button and it all stays where I left it, and reconnects when I put it back on the desk.
- Accessory comparability. I've still got the power adapters from the first ThinkPad I had. They work fine on my current one, and mean that I have more of these bricks than I could ever need - so I can keep one at work, in my go bag, at my home office, in my living room, in my kitchen, and still have a few backups around.
- Repair manuals. Want to know how to do any type of repair on your ThinkPad? The repair manual is freely available, and tells you exactly how to do anything you'd like to. To swap out the network adapter, for example, involves taking off the keyboard and going from the top.
Was ordering it in the first place a pleasant experience? No. The website sucked, I had to call in to do half the customization I wanted, and it still took two months to get here.