take a look at the Patrick Pollet's version of Web Services at http://cipcnet.insa-lyon.fr/Members/ppollet/public/moodlews/. Currently there is a fully functional 1.5.9 version, but he promised some time ago a 1.6 version with some fixes.
Also, that a look at http://www.codeplex.com/Moodle2003WP - SharePoint Web Parts for Moodle. Inside the release you can find some code needed to access the Moodle database directly - but be worry of the changes that might occur in this database on upgrade...
Webservices with asp.net C# and Visual Studio 2008
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