Sony released firmware 1.92.
Apparent changes show that the ability to add Flash wallpapers has been added.
People are also reporting faster XMB load times and XMB screensaver option.
Word at NeoGaf says that the Internet Browser application has been substantially improved.
Cancel the screensaver option: It's always been there.
Controllers auto-power-off now.
Miniclips (thumbnails) in the videos section, and game clips in the games folder all load up synchronized now. Quitting from game into XMB transitions quicker.(Aesthetic/Efficiency Update)
Confirmed: PS1/PS2 Compatibility updated.
Still awaiting official changelog from Sony.