I found Snag.gy when I opened up a support ticket at NextScripts (we use them to auto-post links to our articles to 50+ web 2.0 properties). For some reason our Google+ auto-posts weren’t working and their tech support asked us to take a screenshot with Snag.gy and send it to them. Being stubborn to learning new technologies, I ended up just using Print Screen and Paint and then uploaded the image in an e-mail.
I could have saved some time though. Snag.gy lets you paste files directly into their website. You can test it out by pressing the “Print Screen” button on your keyboard and then go to their website and paste by pressing Ctrl+V (on Windows). After pasting, you’re given a unique URL to the photo that you can share with anyone.
They also support cropping the screenshot and adding text notes/drawings to the image. If you want to manage your uploads (delete them, view a history of them, etc.) then you can sign up for an account on the site. By signing up, you’ll get access to their management features.
According to the FAQ on their home page, the images expire after they haven’t been viewed for 6 months.