BlueRaja

Also, two non-free apps that have saved my ass numerous times:

Spinrite: Data-recovery software. Attempts (and does a very good job, I should say) to recover data on damaged hard-drives using a number of techniques - works on all operating systems and file-systems. The industry standard, as no other data-recovery software even comes close
http://www.grc.com/sr/spinrite.htm ($89)

Active Partition Recovery: When Spinrite says a drive is fine, but hooking it up to another computer you still can't see the data, usually it's due to a botched partition or file-system records, which APR handles beautifully. The combination of APR and Spinrite has at least partially recovered every broken hard-drive I've ever encountered except one*
http://www.partition-recovery.com/ ($80)

*(It was one of the infamous Maxtor Diamondmax drives, which had faulty firmware which caused the drives to overheat so badly that the platters would expand, misaligning the read/write heads. These are the ones that would sometimes work after several hours in the freezer, though this particular one didn't)

The thing I like about Jing is that I can just press a hotkey, click on the part of the screen I want captured, and it'll give me a link to the image I can paste into a conversation. Simple, quick, and definitely worth signing up for a free user account (The overlay is annoying, but that can be disabled).

The only thing I don't like is that it only records videos in .flv format. When I want .avi, I use camstudio:
http://camstudio.org/

This post resparked my interest in good todo-list software, and rememberthemilk.com has gotten a *lot* better since the last time I used it. I now prefer it over my previous recommendations. Enjoy.

A few more to add (the first two are helpful for everyone, not just programmers; learned about them from Steve Gibson's "Security Now" Podcast):

Allsnap: Snap windows together and to the edges of the screen in Windows
http://ivanheckman.com/allsnap/

TaskbarShuffle: Ability to move taskbar items around, use the "Group similar icons" without having them collapse into one icon, and middle-click icons to close
http://www.freewebs.com/nerdcave/taskbarshuffle.htm

Filezilla: Free FTP client
http://filezilla-project.org/

Jing: Capturing images and videos from computer
http://www.jingproject.com/

Audacity: Free Sound editor
http://audacity.sourceforge.net/

GTD-Free: Personal TODO-list. Not fantastic, but I have yet to find anything better (other than Toodledo.com, but that's online-only)
http://gtd-free.sourceforge.net/

Windirstat: Helps free up space on computer
http://windirstat.info/

Easeus Partition Manager: Partition manager, has fixed several problems that (non-free) Partition Magic couldn't.
http://www.partition-tool.com/

And of course, who could forget
Firefox: Web browser
www.mozilla.com/firefox/
Useful plugins:
http://getfirebug.com/
http://noscript.net/
https://addons.mozilla.org/en-US/firefox/addon/315
https://addons.mozilla.org/en-US/firefox/addon/3282

Hope that helps someone :)