These are all MS Windows apps, they have zero dependencies and are as small as I could get 'em. Source is supplied for most.
HoeKey
HoeKey is a teeny (12k) program to assign hotkeys to do most anything. Win-N to run notepad, Win-G to google search on current highlighted word, etc etc. It's configurable with a simple .ini file.
Purrint
Make your PrintScreen button work the way it ought. Save to file, print to printer, or copy to dumb ol' clipboard.
Capster
Have a program run at the startup of windows, but only if your caps-lock key is down at the time.
Reso
Make a shortcut to run an app at your favorite resolution. Once the app exits, it switches back to your default resolution.
Bmap
Yet another damn image viewer. 200k, and it works the way I wanted it too.
gen_yar
WinAMP2 plugin to copy all files in current playlist somewhere
ToPNG
Simple command line utility to convert between many image formats
wherzit
4k app to show hidden windows
DevMgr
little app to create shortcuts to properties of devices normally found in device manager
Push all kinds of keys, and stuff happens:
Tiny hotkey program, configurable with an .ini file.
More information, and downloads...

New! Start only if caps on or off, your choice.
exe (5k)
zip of c source code and exe (10k)
Make a shortcut to run an app at your favorite resolution:

New thrilling version 5.1!
A shmall Win95->XP image viewer. Supports:
bmp, if, jpg, png, ico, jng, koa, iff, lbm, mng, pbm, pcd, pcx, pgm, ppm, ras, tga, tif, wbmp, wap, psd
exe (208k)
Fujimakoto has updated this with mousewheel support here
Make your PrintScreen (and alt-print screen) button work the way it ought. Save to file (bmp, png, jpg, gif), print to printer, or copy to dumb ol' clipboard. Works in any version of windows since Win95, and it's only 114k
zip (113k)
installer (136k)WinAMP2 plugin to copy all files in current playlist somewhere
See this thread
.dll file (8k)
c source code (11k)
Simple command line utility to convert images between many formats. Use like:
for %a in (*.bmp) do topng %a jpg
And you can convert all the bmp's in a directory into jpgs.
.exe file (200k)
c source code (6k)
teeny 4k app to show hidden windows
.exe file (4k)
c source code with .exe (6k)
App to create shortcuts to devices found in device manager

.exe file (8k)
Make a shortcut to boot into your other windows:
exe (10k)installer with sourcecode
removed - vista no longer uses boot.ini
Some Internet Explorer toys: (IE 4.0->6.0...)
.exe installer (24k)
Registry entry to make "news://" type links go to google groups website.
(idea from mr.neomodus guy, but simplified/fixed to not need an external app.)
.reg file (1k)
Comments? sendamail