Web Browsing: Mozilla Firefox
Download Manager(s): uTorrent, Frostwire
Audio/Video: uTorrent, Frostwire
Audio Player(s): Windows Media Player
Video Player(s): VLC Media Player
Encoding/Decoding:N/A
Compressoin/Encryption: WinRAR
Audio/Video Converter(s): Tubehunter
Audio/Video Burner(s): Nero 8, DVD Fab 5
Messaging: Windows Live Messenger, Skype
Email: Windows Live Mail
Antivirus: NoD32, Avira AntiVirus
Firewall: NoD32
Security - Others: Spybot
Cleaners/Optimizers: Dick Cleanup, Defraggler
Word Processing etc: Microsoft Word Office 2007, Notepad
Image Editing: Photoshop, MS Paint
Hardware Monitoring: CPUz, SIW, PC Wizard, AI Suite, PC Probe
Misc: VMware Workstation, Daemon Tools, Truecrypt, Last.fm,

Web Browsing: IE
Download Manager(s): N/a
Audio/Video Download: N/a
Audio Player(s): iTunes
Video Player(s): Quick Player
Encoding/Decoding: N/a
Compressoin/Encryption: N/a
Audio/Video Converter(s): WM Converter
Audio/Video Burner(s): N/a
Messaging: Windows Live
Email: Live
Antivirus: CA
Firewall: Windows
Security - Others: Blahh.. N/a
Cleaners/Optimizers: N/a
Word Processing etc: MS Word
Image Editing: Photo Impact
Hardware Monitoring: N/a

Seems a few of you here use Firefox

Web Browsing: Firefox
Download Manager(s): N/A
Audio/Video Download: Limewire
Audio Player(s): Music Manager ( On Xandros OS on Eee PC )
Video Player(s): SMPlayer
Encoding/Decoding: N/A
Compressoin/Encryption: N/A
Audio/Video Converter(s): N/A
Audio/Video Burner(s): N/A
Messaging: aMSN
Email: Gmail / Thunderbird
Antivirus: N/A
Firewall: N/A
Security - Others: N/A
Cleaners/Optimizers: N/A
Word Processing etc: OpenOffice
Image Editing: Gimp
Hardware Monitoring: N/A
Misc: Kwrite text editor

Web Browsing: Safari, Opera.
Download Manager: NA
P2P/Media Downloads: NA
Audio Player: iTunes
Video Player: VLC, QuickTime
Encoding: MpegStreamclip, Handbrake
Audio/Video converter: Above
Burner: iDVD
Messaging: Adium
Email: Own email server + GMail
AntiVirus: None
Firewall: Hardware firewall on router
Security/Others: None
Cleaners/Optimizers: Onyx
Word Processing: iWork 09, Office 2008
Image Editing: iPhoto, GIMP, Picturesque, Photoshop
Hardware Monitoring: iStat
Misc: Times (RSS), Scribus (Desktop Publishing), Blender + Kinemac (3D modelling), XSlimmer (deletes unused PPC binaries), World of Goo (brilliant game), Spore (brilliant game, but fuck the DRM), COD4 (okay game, not really into FPS), XCode (programming), and iLife (movie editing, web design, dvd burning, blah blah).

Web Browsing: Firefox
Download Manager(s): None.
Audio/Video Download: Warez Links
Audio Player(s): Quick Time or Virtual DJ
Video Player(s): Quick Time or Virtual DJ
Encoding/Decoding: FFDShow
Compressoin/Encryption: WinRAR
Audio/Video Converter(s): Reaper
Audio/Video Burner(s): Demon Tools
Messaging: Windows Live, XFire, AOL, AIM
Email: Gmail and domain
Antivirus: Commodo Internet Security
Firewall: Commodo Internet Security
Security - Others: HijackThis
Cleaners/Optimizers: CCleaner
Word Processing etc: Microsoft Works 09
Image Editing: Photoshop CS3
Hardware Monitoring: N/A
Misc: Teamspeak, Ventrilo, Coffeecup Editor, Dreamweaver, Flash Editor, Photoshop CS4, Dragon Speaking, SQL 2005, Linux, Ubutnu, windows 2008, etc