Ask me about it in person some time, I'd love to wave my hands about and rant why Tumblr is so marvelous. I don't think it is the single solution for all Internet things (see, I'm still posting on Blogger), but I find great value in what it provides and no end in sight for the delights found there. Distilled: animated gifs, fan art, community, content creation, reference photos, and simple interactions.
I continue to favor it as a dumping grounds for artwork. Currently the artwork chain goes Tumblr -> Flickr -> Blogger.
Was in Barcelona last week attending a Music Hack Day event for work. There was a minimum team size of 2 so I worked with a Paul fellow on making a web monome (he had a real monome that you could plug in and use with the site) [Github repo][Site]
It's 11:36pm and I haven't been hit with jet lag pains yet... am almost frightened by that. I don't worry about sleeping either since my eyes are already heavy, now as I type...