When one of our editors got his hands on the ThinkPad T400s, he saw a serious machine for sane, sober business-types. But as any ambitious Engadget reader knows, purchasing your new laptop is only half the fun. To this end, the kind folks at thinkpads.com have put together a rough and ready guide to upgrading your new Lenovo that includes the low-down on all the technical odds n' sods that you crave. Since that's all out in the open, how about you guys get cranking on some truly insane mods? We'll be eagerly awaiting your tips.