ah, I just noticed I didn't provide a link to anything. How rude. I posted on another thread at http://moodle.org/mod/forum/discuss.php?d=70908 if you need any further advice then please get into contact at c.chambers@open.ac.uk. I'm also using this approach in the Offline Moode project I'm working on so you could check this out for a working example. I've been aiming to release it but due to sickness and conference commitments I haven't been able to yet.
Moodle community sites
Moodle documentation: XML-RPC documentation
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