Tumblr feed queued for updating
Register your application to get your own API key (your OAuth Consumer Key).Use this method to retrieve the dashboard that matches the OAuth credentials submitted with the request.Join the thousands of businesses and individuals already taking advantage of the power of automation and let Zapier save you time. A Zap is a connection between two apps made of a trigger and an action.
Auto Schedule Posts has a much more robust set of options, allowing you to actually replicate the sort of "every # hours between x and y times" queuing that Tumblr does.
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EDIT 2.16.12 Found a couple others that come much closer to Tumblr's behavior while working on something recently.
Automatic Post Scheduler provides a simple setup where you specify a minimum and maximum interval between items.
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