Screenshots should be required. Downloading without first seeing a screenshot is like buying something online. You never know if you're really getting until it's too late. I've downloaded stuff here that I'm disappointed with that I would never have downloaded if I had seen a screenshot first. Uploading screenshots isn't that hard either. Just open your screenshots in paint and save them as a different file type. Or, you could go online and download paint.net. It's a free software similar to microsoft paint but more proffesional.

I think it should be required. I never download anything without a screenshot.
I dont understand why so many are having trouble. All you have to do is print screen, paste in paint and save as jpg. Yes there is a drop down box that allows you to save as jpeg. I have never had a problem using this method.