One of our favorite Mac-only tools is CloudApp, a supereasy way to share screenshots and other files. A review in Apple's Mac App Store calls this tool "Simplicity Personified," and we agree — its elegant design is typical of Apple's aesthetic. Once installed, a tiny cloud icon lives in your Mac's menu bar. Drag any file to the icon, and it gets uploaded to CloudApp's servers. A link to the file is automatically inserted into your clipboard — all you need to do is paste it in an email or instant message, and you're off. The best feature is Cloud's screenshot auto-uploading, which makes sharing jokes and software bugs a breeze. Users of the Free version are limited to 10 shares of up to 25MB each, while users of the Pro version can send an unlimited number of 500MB files.