I'm currently busy fighting demon ninjas in hell, so there's no way I can confirm whether or not this news is true.CONFIRMED: According to the Loot Ninja, PSone downloads are now available for American PLAYSTATION 3 owners. The following titles are available, all at $5.99 each:
Hot Shots Golf 2
Most games are over 400MB, so you'll need a hefty Memory Stick to get your gaming session on. The games require firmware 3.01, but that won't be a problem for anyone, including homebrew users.
[Update 2: A NeoGAF user has posted pictures of his PSP running Syphon Filter. It can be pretty informative.]