Mac/Windows: When you need to quickly upload a screenshot or file, you have plenty of different options to choose from. However, Puush might be the simplest one out there.
Every time you take a screenshot with a keyboard shortcut, Puush automatically uploads the file to the Puush servers and you're given a quick link URL. The same goes for files. Drag a file to the Puush icon, and it's uploaded right away. You get 20MB per file, and 200MB total for the free service. If you find yourself sharing a lot of files, and don't feel like dealing with the likes of Dropbox or any of the photo sharing services, Puush is a dead simple way to instantly share a file.