[this is a public entry]
A heads-up to anybody who is running an alternative operating system on a Playstation 3 - Sony will be releasing an update tomorrow that will prevent you from doing this.
As I don't have a PS3 myself, I'm not sure whether you can just choose not to install the update or not, but one assumes that at the very least you'd be able to stop it from getting it in the first place.
[ETA: From the article:
Sony has said the update is optional, but those people that do not install it will no longer have access to features, such as its online games network and the ability to playback certain games or Blu-ray DVDs that require the most up-to-date firmware.
A Sony spokesperson said that gamers would have to "accept" the update before it begins to install.