Sony released the 3.72 firmware update for the PlayStation 3 today. You will need to have a spare 190MB of space for this update, although the improvements are marginal.
According to the official post, Sony has revealed that the update improves "playback quality during use of some PlayStation 3 format software."
This comes shortly after Sony changed their terms of service in order prevent people from suing them with group lawsuits in the future. For more information go here.