Ubuntu Hardy (Linux)

Window manager: wmii
Left column: xterm, Firefox (with Vimperator), 2nd Firefox window
Right column: trayer, conky, irssi (irc), irssi (bitlbee), Datacenter

Datacenter is something I wrote myself. Default view is the radar and temperature. It also displays torrents + clock when Azureus is active, and a summary of the TV shows I watch, where they are, and when they're usually uploaded, when it's checking for new episode torrents.