@jacquesm please send me a list of URLs to crawl (10M+), and I'll set up an 80legs job to do this. shion - at - 80legs - com.
We've (ArchiveTeam) unfortunally made Posterous unresponsive multiple times. So please be careful to not completely bring it down if you're doing a solo effort.
Please also bear in mind that it's not just to "chuck it into the downloader"..
We're using WARC (Web Archive) which is an official ISO File Format standard - which the Internet Archive's Wayback Machine can use. It's also a pretty good and nice format for archiving web pages in general.