These are automated daily builds of the code in CVS. They contain all the latest features. They may also contain bugs and/or undocumented changes... :-) The top line is the latest.
mod - The file you should name "archos.mod" before copying it to the root of your archos.
ajz - The file you should name "ajbrec.ajz" before copying it to the root of your archos.
rocks - All plugins for this particular release of Rockbox.
full - Full zip archive, with rockbox, plugins, languages, docs, fonts, ucl etc.
ucl - File to use when flashing Rockbox
Please also look at the documentation for do-it-yourselfers.
This table shows which targets are currently compilable from the CVS code, and how many compiler warnings the build generates. "OK" means no warnings. The batch timestamp is GMT.
These builds are as "bleeding edge" as you can get. They are updated every 20 minutes. (See status on the first line in the above table).