just quietly, some things i'm keen to see in posterous + some solutions for now.
1. custom themes - this has been promised for the future i think.
for now: autopost to tumblr or your other site and use posterous only for posting easily.
2. custom email posting - ie. postthis@yourdomain.com
for now: set up your own email that automatically forwards to your posterous posting email. eg, a filter set in gmail.
3. location tagging - append post with L:address and a point on a map will be added to your post. likewise gps or google lattitude could be accessed to do this when requested.
for now: brightkite? it posts to flickr and twitter already but doesn't use GPS and doesn't post to posterous.