Years of building and maintaining my Wordpress blog have resulted in my learning a lot about Wordpress and getting a lot of grease under my fingernails. Weeks of using Posterous has resulted in a media-rich blog with several posts per week. Tell me which service is more powerful.
I've had the same reaction to Posterous. Easy to use. Dynamic. Powerful. And I'm barely using its best features. Did I mention it's easy to use?