EDIT: the rant is at http://unalone.tumblr.com/post/70951166/is-it-just-me-or-is-...
I still prefer Tumblr to Posterous. Themes are big. The user interface is big. Posterous has neither, and it suffers for it.
It's more that Tumblr's not perfect anymore. With v4, I couldn't think of anything I wanted added. It could have stayed like that for a decade and I'd still use it. It was fast, concise, beautiful, uncluttered. v5 is a step back. It adds clutter where there was none before.
I'm hoping it's temporary, because Tumblr's staff is incredible and they listen to users. (I hope more than just me complains about this.) But for now, it's pretty irritating, which is to say less than perfect. It's still the best on the market.
It's expanded to much more than a overly simple blogging interface, now it's a full fledged blog app. V5 looks amazing and the video demo does it great justice.
It pales before Charles Forman's presentation from Iminlikewithyou, though: he's part of the NY Tumblr crowd. This was easily the most over-the-top thing I've ever seen, and it's hilarious:
I can read a paragraph of text before the loading icon on yr goddamn video has even begun to spin.
But a launch should be about spectacle. It's completely fine to have fun if you're not getting in people's ways.
This is going to be an interesting year for tumble & microblogs, can't wait to see what's next :)
If so why did you choose Tumblr over creating your own; easier to create/maintain, better SEO, additional way to promote your work.... ?