My new WordPress Web Service plugin is your solution!
WPWS allows you to access your WordPress installation via WSDL/SOAP. In contrast to classical RESTful services WSDL/SOAP is type safe meaning that you always get what you expect. RESTful services can change their normally not explicitly defined API from one day to the other and … BANG! You web application crashes.
After you have installed WPWS you can simply open your blog and append
?/wpws to your blog’s url.
My plugin for example is accessible through bkahlert.com/blog/?/wpws.
The following screenshot shows what the plugin’s homepage looks like.