This is great!
I've been waiting for this (hence my messages to Chritina, hoping to try myself at updating her script) and WP1.1-final in order to move my entire blog out of pM - looks like it's coming at long last! Thank you !
One thing I wondered myself while thinking about starting from scratch : how do you deal with upload pictures ? Do you copy them and replace the code in the post, or is it up to the owner to edit the message accordingly, reuploading the file to the right place ?
Try creating a Importers page on the Wiki, maybe that might launch a few more efforts, and gather some help around your own.
Again: thank you!