ShareX is an excellent free (open source) utility that will manage a queue of image files and automatically upload them to a number of services including: imageshack, tinypic, imgur, flickr, uploadscreenshot, dropbox, rapidshare, and your own ftp server.
(Note: ShareX was previously known as ZUploader).

Just like Screenshot Captor, the authors of ShareX ask for donations and we suggest you make a donation to them if you use their software.

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To use ShareX with Screenshot Captor, simply visit the ShareX site and install the latest ShareX Setup.exe.

You will then automatically see a new TOOL item in the TOOL menu of Screenshot Captor that will let you queue the current file in ShareX for processing.  Or you may drag thumbnails from SC into an open ShareX window.

In addition, you can check the box on the Automatic Uploads tab to automatically upload new screenshots using ShareX.

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Visit http://code.google.com/p/sharex/downloads/list



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To run ShareX with Screenshot Captor portably -- unpack the ShareX.exe file and associated DLLs into *this* directory.