I held a Playstation Portable in my hands today. Nothing about the experience made me any less impatient for the day when I will own my own. It is somewhat larger than the Nintendo DS, but the space is put to good use with the incredibly gorgeous and vivid screen, rather than being wasted with a (so far) useless touchscreen. The controls feel good. I did not experience the problem with the square button that many have reported. The analog stick is amazing. It’s a marvelous piece of technology.
I note with some pleasure that it is possible to transcode video for playback on the PSP. While you’ll only get about one movie per memory stick, it’s still a nice little feature.