PS3 Firmware Update 3.60 has just been released, so if you're in touching distance of your PS3 console, you'll now be able to turn it on and update to the latest version.
The biggest feature to happen with 3.60 will only actually affect those who subscribe to Sony's premium service, PlayStation Plus, and that comes in the form of Cloud Storage.
This will give you some storage space on Sony's servers, where you can upload stuff that will connected with your PSN account. This could be game saves, games, wallpapers, whatever. Very useful really.