There are several incontrovertible truths about the Swiss Army Knife - it was invented by the Swiss, made famous by their Army, and all variants contain at least one blade. Back when it was invented though, it was a pretty simple device: a blade, a screwdriver, a can opener and a punch were the original tools.
Over the years, it's got more complex. You can now buy knives containing laser pointers, USB drives, MP3 players, even an altimeter, while the most complicated version - admittedly created to celebrate the company's 100th anniversary - contained 85 different tools.
The parallels with the PSP are easy to spot.
Just as the knife ended up with more tools that were less useful, so Sony's pushed the PSP into becoming the do-it-all-averagely-portable device