The SWX Wordpress API by Benjamin Wiederkehr opens up Wordpress to Flash developers. You can get all posts or search for posts by author, category, id, date, or tag. You can also play with comments, authors, categories, tags, images, and options.
Here's what Benjamin says about it:
The idea of creating SWX-Wordpress came when i was strugling with a project at university. We had to create a prototype of some databased driven application . . . I was using a handwritten script to connect to the database and it was such a hassle to get the data that i spend more time on that than on actual designing the visualization.
During summer I experimented a little with SWX and decided to rewrite the above mentioned visualization with the use of SWX. What I need first is a solid library of functions to get the needed data. I took the Wordpress Template Tags as my archetype and thought out a basic set of functions with the data and datastructure they should provide. The result is the actual function catalog.
From here on it was just a matter of programming skills (I had to learn), good coffee and some nightshifts in front of Textmate.

don’t get it is it a data format like xml?
Excelent comment. My Favorit Blog. Thank you and best regards from Autoversicherung