I use clarify. It’s the third screen-shot provider I’ve used over the last 4 years. The problem is that most screen-shot sharing software gives you an account for free and then revoke’s it (first client I used closed it’s hosting service) or makes it payware (like droplr). So the best thing to do, would be have a private hosting like S3 and manage your shared images that way. Dropbox is a good option too if you have an account.
Exactly, I used to love Skitch before it was acquired and no way I was going to signup with Evernote which led me to this solution. Captured does have integration to Imgur and Dropbox as well has straight SFTP and S3 uploading. I’ve been in contact with the developer and it’s in good hands to ensure the directly file uploading feature doesn’t go away.