[PSPrumors.comGamespot has an article about the appearance of cryptic PSP ads in Japanese magazines. The ads themselves are composed of just a QR code - like a 2 dimensional bar code which when decoded, presumeably points to a URL with more information or perhaps a release date. The only software I could find for decoding them was in Japanese and I couldn't get it do do the right thing - anyone else want a shot?

I found this post through my bloglines RSS searches. And they looked desperate for answers, so I fired up my W21S and decoded the QR-code and herd's what I found:
The code when decrypted links to http://www.playstation.jp/psp/ but the site can only be viewed on a mobile phone. The site is a small info site where I could see 4 items.
One was explaining the origin of the name PSP, the other one was giving more details on the screen that the console will be using (272x320) sounds crap to me... for a screen this size. Thirdly, there is an "En-Ke-Tto" as they say, basically a questionnaire that if answered gets your name entered in a draw giving you a chance to win one of a 100 PSP.
Finally, they claim you will be able to see the PSP again at the forthcoming festival called ENTAMA from October 22-22: the 2004 Tokyo International Entertainment Market.
That s it. I suppose that they wil keep on adding some info on the site as time goes. And no release date this time lads... sorry.