copy and paste from this thread: http://www.vgchartz.com/forum/thread.php?id=77844&page=1
Well I can say 2.8 is either out now or will be in a few hours.
http://blog.us.playstation.com/2009/06/23/ps3-firmware-v280-update/
Some might consider it a minor update but it isnt. It actually coincides with another major update.
http://www.nordichardware.com/news,9511.html
Its a driver update. Driver updates can improve overall performance of games on the system. Even the old laggy games released at launch will probably feel the effect of this because it can improve stability of the content.