Welcome to TinyApps.Org, a guide to very small software for your PC. Virtually all of the programs listed here are free of charge and for use under Windows (Palm and OS X pages also exist).Imagewell is worth the trip over there.
This tiny application is going to save me 8,000 hours creating blog posts. It allows me to capture a portion of the screen, change the images size and shape, and upload to my .mac account. All in one application!