Posterous, the popular minimalist blogging service, just released a major update to its service, which includes customizable themes, a feature a lot of users had been waiting for. Users can now choose between five different themes, all of which are highly customizable. According to the company, additional themes will be added over time. Users can now also easily import their Tumblr blogs and even use their Tumblr themes as Posterous now also supports the Tumblr theme format. Posterous also announced that its traffic grew tenfold over the last 12 months to 4.4 million 
We always liked Posterous, which launched last July, because of the simplicity of the service. Just one email to post@posterous.com will get you a new blog, for example. Over time, however, the company has added lots of additional features, including the ability to use your own domain name, track subscriptions through Feedburner, and embed a wider variety of media files. In addition, Posterous also launched a very nifty iPhone application (iTunes link) last month.
Given that Tumblr is probably Posterous' strongest competitor, it only makes sense for Posterous to give users an option to import their Tumblr blogs.
The new themes still follow Posterous' minimalist design philosophy, though given that users can edit the CSS themselves, they can now take control of their own designs.
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