What's up with Tumblelogs?

For someone who made the switch to an actual blog, is having a tumblelog (via Tumblr) redundant? It was fun as it lasted, as they say.

I use this blog to post personal thoughts and ideas, I use Twitter (@USuMBS) to share daily musings, and I use Engineerography Blog to write about a more topical and public matter. I even use Flickr to organize and share my personal photos. (I have a Picasa Gallery that is dead and a MobileMe Gallery that I am not sure how I should use it. And I don't do videos [yet].)

Then, I aggregate everything to Facebook. I think that's being plenty virtually social. But is there anything else that I should jump on the bandwagon for? I may just give up on finding a niche for my tumblelog. Does anyone actually read it? Hmm.