[binarysoul]

when you migrate, you may want to setup jekyll to handle your redirects (from your old site's url structure)

I wrote about a jekyll plugin that allows just that (used it when I migrated away from tumblr)

http://rawsyntax.com/blog/blogging-on-jekyll-url-redirects/

[AlexeyMK]

Thanks! That's a useful solution; the Posterous importer I used added a permalink, IE "/path-to/original-post" in each post's header. Worked reasonably well.