Update: beefmanbeefer has confirmed it to be working with PS3 Firmware 2.20, however, based on reports it appears it doesn't work with lower Firmware versions.
He also shared a video (below) and states: Here is PS3 Home BETA crashing, what I do in the video is this: First I try to connect to the servers and it fails. Then I press X to try to connect again, and almost simultaneously I press the PS button and go to quit. It then says please wait and then the ps3 finally crashes when you hear the 2 beeps.
Hi, My name is Krystian and my english is bad, that's all about me :)
I found some interesting thing when I was 'playing' with PS3.ProxyServer. I replaced some XML files, and now I can install PlayStation@Home public BETA Trial from PLAYSTATION@Network servers in XMB.
I think it's to prepare for real open BETA, and that will be unlocked very soon by Sony.