Let me nominate some of my own:
Linux distro of choice
Arch Linux -
www.archlinux.org
Server/Workstation OS of choice
FreeBSD 4.9 -
www.freebsd.org
Random programs
Quick image editing - Gimp 2.0-pre1
Terminal - Aterm
Shell - zsh
Office suite - OpenOffice
Window Manager - FluxBox
Email client - Sylpheed
text editor - nano
ftp client - gftp
ftp server - glftpd