The ThinkPad TransNote (2001) delivered a pressure-sensitive notepad attached to the notebook, with whatever was drawn on the notepad being transferred into software. It wasn't particularly effective, with recognition based on sensitivity under the pad at a very basic level — nothing as sensitive as a Wacom. This computer came in both left- and right-handed versions.
The ThinkPad 701C (1995) featured an award-winning keyboard design and brought full-size keyboard width to a 10-inch laptop thanks to the "butterfly" design. The keyboard split to shift within the boundaries of the screen when closed, while forming an 11.5-inch keyboard when open.
A much more recent power-packed design, the ThinkPad W700 (2008) was built as a true powerhouse desktop replacement. With a 17-inch 1920x1200 screen and packed with Extreme Edition Core 2 processing, it most notably featured a pull-out second LCD and an integrated Wacom stylus tablet. Many owners still have this on their desk as a solid photo-editing machine. Just don't try to carry it around in a typical laptop bag.
ThinkPad Reserved Edition (2007) was a very limited-edition model that featured a premium leather case. The case was designed to ensure that the laptop could still vent effectively even though it was wrapped in leather. As it was sold "by invitation only", you probably need to know some senior Lenovo executives to meet someone who owned one.
One of the crazier ideas for the all-in-one business on the go, the ThinkPad 550BJ (1993) added a built-in bubble jet printer to the laptop. To us, it is both perfectly sensible and senseless at the same time.
The ThinkPad is well known for its TrackPoint nub in the middle of the keyboard, but not every ThinkPad featured the pointer. Here's one early design that opted for a trackball at the top right. Thankfully, the TrackPoint became the ThinkPad standard instead of this.
Seamus Byrne attended a Lenovo design labs tour as a guest of Lenovo.