We all have programs that most people never heard of but are indespinsible to each of us. Here are a few of mine, how about yours?..
Thumber www.tawbaware.com This little program sucks pictures off my camera and puts them in a directory I specify. I have it move my pics to my picture directory with today's date. Then it will rename them from the cryptic DC100-3514 to whatever I want using the pic's exif info or whatever criteria I give it. For example, I can have it rename them year, month, day and time so have a pic named 2008, 11 05 1927.jpg or have it name them by shutter speed, aperture, zoom and so on. It also makes an instant thumbnail web page with clickable links to the full size pictures, all I have to do is upload the directory it creates. It does lots more like lossless rotating but that's just the highlights.
Clipmate www.thornsoft.com/ It's like your clipboard on steroids. I store hundreds of copies and can pick and choose what I want to paste. It lets you copy a bunch of items then walk up or down them, pasting each in order. You'll just have to try it to see what I mean. I can't do without it. I keep my CC number in it so when I need it all I have to do is highlight it and paste.
Faststone capture www.faststone.org/ It supercharges PrtScn and gives me lots of options and has it's own image editor.