Whether or not you believe in the Post-PC era malarkey, there is no denying that the emphasis on personal computing has shifted on to smartphones and tablets rather than the latest Bulldozers and Geforces. After all, it's not the size that matters, but what you do with it...
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips