Despite a number of misgivings, Sony's bad media track record and apparent hostility towards independent developers, I asked for and received a PlayStation Portable as a Christmas present. So far I'm pretty hooked on the dang thing, and I only have two games, Madden '06 and Lumines. Not having been invested in video games for the better part of a decade or more, Madden is a long term investment. Jiminy, the amount of game options makes an airplane cockpit look easy. Lumines, a Tetris-style game with a lot of polished chrome, is dirt simple and fills in when I don't want to think hard. I've only had the PSP for about a week, but I'm pretty impressed, despite Sony trying to blow its foot off.
Today I was struck by how much computing and communication power is packed in these portable packages. Check the PSP specs versus the seminal PARCTAB. In about 15 years, we've gained a low cost, mass produced PARCTAB, with a high powered graphics engine and minimum persistent storage of 32 MB, with gigabytes easily available. Plus multiple communications options: IR, Bluetooth, and Wi-Fi. My off the cuff estimate is that you've got a factor of 30 speed up on the processor, about two orders of magnitude communications speedup (38.4 kbaud IR vs 10 Mbit/second Wi-Fi), and over 3 orders of magnitude on the storage. With relatively decent development environments available, this would seem to be a cornucopia for ubicomp researchers.
And I haven't even mentioned cellular phones!
People beat Vannevar Bush's "As We May Think" into the ground, but Mark Weiser's "The Computer for the 21st Century" was pretty doggone prophetic too.