Climsy shares images on your clipboard via Dropbox and Imageshack
Right now, Climsy only supports full screen (Prt Scrn) or single application window captures (Alt+Prt Scrn). We'd like to see a selectable region capture, a la Screenpresso, added to round things out. We'd also like to see support for short URLs, just in case some of our links get a bit lengthy.
Climsy is available as an installer and as a portable application, and it's totally free for both personal and commercial use. It's incredibly lightweight, too -- barely clocking more than 1MB of memory on our Windows 7 test rig.