http://www.jp.playstation.com/scej/t.../trial_dl.html
Hit one of the Download buttons, and place the EBOOT.PBP file into /PSP/GAME/UCJS10041 on your memory stick.
The catch: you need firmware 2.70 to run it. It's not available on the American PSP web site yet - you have to run Network Update on the PSP itself to download it.
BUT, 2.70 includes Flash Player 6 or something like that, so it might be worth tinkering with.