In case you haven't noticed, Lenovo has a thing for re-introducing machines with a tweak here or there and maybe a dash of new functionality. The IdeaPad S10-2 is a great example of that, as is the partially-new, multi-touch ThinkPad T400s. Frankly, the ThinkPad T400s that emerged in June wasn't all that different than the original ThinkPad T400. The T400s offered a slimmer profile, a tweaked keyboard, a few new internal hardware upgrades and optional WAN connectivity. The new T400s, which is equipped with Windows 7 and a multi-touch display, adds one major feature: touch.

But really, is adding touch input to an already decent notebook enough to make you think twice about buying a Lenovo? Or better yet, could it convince existing T400 and T400s owners to upgrade? In the pages to come, we'll take a look at how think machine performs with a new operating system. Unlike the original T400s that we reviewed earlier in the summer, our multi-touch T400s shipped with Windows 7 Professional, whereas the earlier T400s shipped with a variety of Vista options...