Share Bucket (free) enables you to annotate and upload screen captures. While it may not be the most original idea on the Mac App Store, it's certainly a welcome entry to the field. It offers simple, cloud-integrated sharing with a few minor growing pains.
Share Bucket supports Dropbox, Google Drive, and SkyDrive. You pick the destination and authenticate.
Menu bar-based options enable you to capture and annotate or to upload existing images to your account. Once uploaded, the app triggers notification center, so you always know when the material is ready to use. A URL awaits you on the system pasteboard.
A critical "Auto
