Besides thinkpad, there are also some Dell business models and mobile workstations, such as Dell e6400 and Dell m4600/m6600.
There are also some HP products, HP HP6400.
Sony has launched a very compact pocket book, and Sony VGN-P70H.
Asus also used it, ASUS s200.
Fujitsu also has several models. Fujitsu e84 10
However, other brands' pointing sticks are not red in color and feel worse than thinkpad.