If you were looking for any reason whatsoever to hop into a celebratory mood, why not join IBM (or would it be Lenovo these days?) in celebrating the 15th birthday of the ThinkPad. Of course, tech historians are likely to bicker over the ThinkPad's true day of emergence, but reportedly, the IBM 2521 (later renamed the 700T) ThinkPad holds the honors of being the first of its kind to ship in July of 1992. Interestingly enough, one could argue that this very machine was actually more akin to a tablet PC than a bonafide laptop, but it proudly donned the ThinkPad logo nevertheless. So, ThinkPad owners, today's your day to gift that oh-so-industrious machine of yours with a few extra moments of rest, but before you do, why not let us know what model you're partying with if you're in the club?