Sony has sent out an invitation for PSP owners to beta test their upcoming title Siphon Filter: Dark Mirror. All they ask is that you go to http://pspbeta.us.playstation.com on your PSP's brower, submit an application, and hope they pick you.
There is one catch though: Sony is requiring that all applicants use (the still unhacked) PSP firmware 2.6 just to apply. Clever plan. Create excitement by having an open application process to beta test an upcoming game, hoping applicants will choose to forgo their downgradable/downgraded homebrew friendly firmware just for a small chance to play a new game before it's out. Thanks, but I'll stick with my 1.5 PSP chock full o' stuff.
(Read on for Sony's invitation; thanks, al. Check out PSP Fanboy for more.)
[Thanks to everyone that tipped us!]