The 1.90 Firmware update just hit Japanese PS3s. Here are the features:
• Ability to rearrange games on the XMB
• Option menu now includes "eject disk"
• Press triangle to eject games/CDs/movies in the XMB
• XMB backgrounds --- Ultimate PS3 Wallpaper Guide! (Click Here)
• Change the folder classification
• Change CD output to 44.1/88.2/176.4kHz
• Force 24Hz output for Blu-ray over HDMI
• Change PS3 video settings in-game
• "Bit Mapping" in the "Music Setting"
• Save AVCHD type animations from a Memory Stick
• Change settings like upscaling while playing PS and PS2 games
• Add bookmarks
• Web browser security function in the browser's tool section
• Avatar moves during audio visual chat
The customized backgrounds are finally here! Hooray! All that's left now is In-Game XMB! Sony, don't let us down 2.00!
Source: Watch Impress