Tumblr is, of course, the blogging platform that's taken off lately, featuring an easy way to quickly post a lot of different kinds of media, as well as share it across friends and networks. Tumblr's iPhone app has been serviceable since it came out, but it hasn't always been the best option for posting to the service. Still, a 2.0 complete rewrite has helped a little bit, so if you're a Tumblr user who wants to post more while mobile, it's worth another look.
The new update brings a brand new interface to handling multiple blogs, as well as improvements to posting and the main dashboard. You can now read and reply to messages on the service from right in the app, and if you're new to Tumblr, you can sign up right from the iPhone app, too.
The service is free, and so the app is too. Power users will probably still find some issues with the app, which makes sense -- posting blog posts from the iPhone is probably never going to be quite as easy as doing it from a PC. But for those times when you're out and about and want to do a quick Tumblr post, the app should serve you just fine.