Great news! This just arrived in my mailbox:
Posterous users finally have a zero-data-loss option for switching to another blog platform. Read the Posterous Migration Guide to see how Posthaven stacks up against Wordpress, Tumblr, and Squarespace options. We've imported over 850,000 posts, photos, videos, audio files, and documents in just the past few weeks.
You now have full access to Posthaven and can import your existing Posterous blogs, create new blogs, create new posts using the web post editor.
To keep on top of the latest feature updates, we recommend following @posthaven on Twitter. This project is under active development.
Please feel free to email us at firstname.lastname@example.org if you have questions, feedback, or anything we can help with.
Yours faithfully in code,
-- Garry and Brett