Last week Sony released the v2.42 firmware for the PS3. It was a minor update that “improves the playback quality of some Playstation 3 format software.” Unfortunately, while it has affected PS3 software, it hasn't been in a good way.
PS3 owners are reporting a variety of issues ranging from discs not playing to not being able to get online functionality to work. Unfortunately there hasn't been any response from Sony thus far.
If these reports are indeed accurate (there are enough of them to make me think so), then that makes the second update in a row that Sony botched. The 2.40 release was heavily bugged, which prompted 2.41 getting released shortly after. Looks like we'll need yet another patch.