Last night we released two updates to our Tumblr integration.
We now use OAuth for all of our communication with the Tumblr API. When we originally released our Tumblr integration, there was no OAuth support at Tumblr. Now that this is available, it makes for a much easier setup process for you, our users, and means that you don't have to give us usernames and passwords for your accounts, which is more secure for everyone involved.
All Tumblr accounts were automatically upgraded last night to use the new authorization method by using xAuth, which provides us with an OAuth authentication key by using the username and password you stored when setting up your Tumblr account in dlvr.it. Now that OAuth is enabled, dlvr.it does not store any login information for Tumblr - we only keep the authorization tokens necessary to access the Tumblr API. This means that changing email addresses and passwords in Tumblr will not cause problems with dlvr.it and require you to update your credentials.
Along with this update, we also released Tagging support. Just like our Auto-Hashtags support in Twitter and StatusNet, the Tumblr integration now allows you to automatically tag your posts with up to five of the tags specified in your feed's "category" tags. The instructions for setup are identical to Twitter or StatusNet.