The Open Source PSP-OSS Shell for the PSP has been released, heres the info from the readme:
Features:
*Audio:
Built-in audio player
MP3 and OGG support
*Image:
Built-in image viewer
PNG and JPG support an resolutions up to 512x512
*EBOOT Support:
Run any EBOOT off you memory stick via the "Start Menu" (1.5 firmware)
*Filebrowser:
Easily access your memory sticks files via included filebrowser
Ability to Open, Cut, Paste, Delete and Rename files
*Easy-to-use GUI:
Restart and shutdown the PSP-OSS from the desktop
Run any UMD from the desktop (excluding UMDs requiring 2.xx)
Edit your theme or background from the configuration panel
Enable/disable USB mode
Access time and date information
*Shortcuts
Look at Shortcut.ql example on the desktop. Open in a text editor
*Folder Locations for Desktop and Start Menu
Files you want on the desktop or in the start menu go in these folders
Desktop: PSP-OSS\DESKTOP\
Game: PSP\GAME\
Music: PSP\MUSIC\
Pictures: PSP\PHOTO\
Download this excellent new shell via the comments and leave feedback