Diplay/Login Managers
No preference
Bootloader
Grub2
Archive Managers
File-Roller
Calculator
No preference
CD ripper
No preference
File Managers
PCManFM
Fonts
No preference
FTP/SSH
ssh (cli) + FileZilla +sshfs (cli)
Games
No preference
Image Editors
GIMP
Image Editors (vector)
No preference
Image Utilities
gcolor2
Image Viewers
GPicView
Instant Messengers
Empathy
IRC Clients
I'd probably just use the IRC client in the IM 
Mail Client
No preference
Microblogging client
No preference
Music Editor
No preference
Music Players
moc (cli) + Rythymbox
Music Tagger
No preference
Network Managers
Network-Manager
Notes
No preference
Office Apps
I would have said OO.o but the latest versions of Abiword seem ok. So Abiword for me.
Password Manager
No preference
PDF Reader
Evince
Podcast client
No preference. Would probably just use Rhythmbox
RSS reader
Again, no preference, Live-Bookmarks in Firefox
Search Utility
No preference
System Information
No preference. sudo lshw > hardware.txt 
System Monitors
Conky + htop (cli)
System Panels/Menus/Trays
Tint2
Terminal Emulators
Terminator
Text Editors
nano (cli) + Gedit
Torrent Clients
Transmission + rtorrent (cli)
Video Editor
No preference
Video Players
VLC
Video Transcoder
DeVeDe or Handbrake
Web Browsers
Firefox
Other
Gparted is a must. Gdebi would probably be useful for less advanced users. Is it stupid to include ObConf here?
And LXappearance?
Linux Expresso -My collection of Computer madness