Firebird's great... I can use it on all of my machines... makes IE look like Netscape 1.0

Ah, one that I've used for awhile and never put in here:

Treesize Professional

I'm making this same post on both the Windows and Linux threads because it can pertain to both. Also, it's actually an extension to a program rather than a program itself, but it's SO excellent that I just have to share it with people and these two threads seemed like the most appropriate places.

Anyways, it's called AdBlock and it's an extension to Mozilla and/or Firebird. It can be downloaded from http://adblock.mozdev.org

Basically, it makes it REALLY easy to block banner ads and other advertising images from websites as you browse them and it just recently had functionality added to block flash advertisements in pages too :D

If you use Mozilla or Firebird, I HIGHLY suggest you check this out!

www.pricelessware.org

Lots of awesome freeware. I go there almost any time I need a new Windows app. Great site.

Ill have to vote for WinBar. Its a pretty good piece of monitoring software. I have had some games not like to run while it is running, but other than that, its great.

I also vote for RegCleaner and Firebird. A great way to clean your registry and the best browser out there.

eMule seems ok, but all the servers appear to be from Europe.

Winamp
Google Toolbar
Winzip
AIM
Bittorrent is good
BT++ is bettar
WCPUID
Winrar
divx
ad-aware

Figured I would bring this back from the dead.

My programs are:
DeadAIM - no ads/"lite" version of AIM
Driver Updates
3DMark03 - benchmark
3DMark2001 - benchmark
PCMark04 - benchmark
PokerStars - online poker
Ad-Aware - spyware remover
Spybot - spyware remover
Spyware Blaster - spyware preventer
Bearshare FREE - downloads
Mozilla Firefox - awesome browser
Norton Anti-virus - Anti-Virus
Office2003 - Powerpoint, Word, Access, Excel
Divx - multimedia encoding
SpeedFan - monitor CPU temps
WMP10 - music/video

Most of my faves have been mentioned already but there are a couple i'd like to add:

Wingrep - Good windows version of grep with a well thought out GUI
XnView - I downloaded this one yesterday because my friend wanted a freeware image file cropper + converter and didnt have much space on her computer. It works quite nicely and has lots of techy image conversion options and supports a lot of formats including GIF and JPEG

Of course, i'm using Firefox at the moment so i have to mention that its my preferred browser. Some people need to give it some patience where the memory footprint and other "issues" are concerned, because lets face it, it hasnt even reached version 1.0 yet and it rocks. Plus, being a web dev guy, i like the fact that it implements more CSS standards than IE

Winamp
Firefox
Atomic Clock Sync
Kazaa Lite Codec Pack
Windows Washer
Nero
MIRC /w Invision 2.0 scripts
Winrar
Norton Corp
ZoneAlarm Pro
Emule
Photoshop/Acrobat
CloneCD
ABIT motherboard manager
Open Office/Office 2003
SnagIT (Great program for saving desktop/screen things as jpegs)
Spybot
Adaware
AudioGrabber + LAME

I usually also have MSDN Resource Kit on here, but I don't use 95% of it.

Man did I miss a few things. First of all. Bittorrent (the initial program that most people use) sucks ass. BT++, unimaginably, sucks even worse (mostly because it's a system bloat). A revised list, if you will, of every single program that I would download for Windows after a fresh install.
3dMark2001
3dMark2003
AdAware SE
AC3Filter
Alcohol120
Azureus
CPU-Z
Divx
Direct X 9.0C
FFDshow
FireFox
Matroska Pack
Motherboard Monitor
Media Player Classic (replaces Real One)
Java (from Sun not MS JVM)
Nero
Nimo Codecs
PC Mark 04
Real Alternative (also used to replace Real One)
Smart FTP
Spybot
Spyware Blaster
TCPOptimizer (changes some Windows default internet settings to "optimize" bandwith usage)
TightVNC
TMPEG (avi to mpeg converter)
VirtualDub
Vobsub
Winamp 5
Winzip 9
WinRAR
Xvid

That's my list

The second I got my Windows installed, I installed Firefox, so I could download Azureus, so I could, well, you know.

Nero 6, Ad-Aware SE -- even though I never get spyware from, Kerio Personal Firewall
Plus a Google of others you guys all ready mentioned.

I can't believe more people haven't referred to Proxomitron [www.proxomitron.info].

This has simply got to be the best single utility available.

Mr Mephisto

Heres me:
Winrar
mIRC
Winamp 5
Office (the newest available)
Adobe
photoshop
Acrobat
illustrator
Gaim
Desktop Sidebar
Maxthon (browser)
Irfanview
alcohol*120%

I try to keep pretty light on my apps, I hate processes running

SiN and the others with Deamon tools... Try alcohol*120% for your virtual CD-ROM drive. It creates images reads images and will mount the virual CD-ROM drive and load images. I love it and have never ever run into a single problem with it. Very highly recommended.

GIMP is great, and a ton cheaper than any other image manipulation software I've found...

If anyone hasn't heard of Spybot Search & Destroy it eliminates any need for a pop-up blocker, I run it about once a week and never recieve any pop-ups.
Mirc
burst! torrent client
Free Download Manager
Kazaa++
AVG Anti Virus
RegScrubXP
WinAce
WinZip
Divx
RealOne
Johnny Castaway Screen Saver
Auto-IT

I try to keep my computer as minimal as possible.

After reformating, and installing all my drivers. I install

AIM ( + AIM Ad Hack, Removes Ads for 5.9 )
WinAmp
WinRAR
gTray
gogo Adbuster ( popup blocker )
Panda Anti-Virus ( sometimes )
and
Spybot.

Opera
Ad-aware
Kazza K++
Shareaza
Damn NFO viewer
WS_FTP Pro
Nero
WinRar
Office 2003
Uxtheme patch
iTunes
Real and Quicktime alternative

I just dled GIMP and its fucking awsome, seems to have most of PSP for free and packaged in only 7mbs