I too looked at this a while back, though efforts to integrate Moodle 2 and SharePoint 2010 seem to have stalled. However, you may have (at least) a couple of options.
As I understand it, SharePoint libraries can be set up to use WebDAV interface (if Desktop Experience is enabled). So, you may be able to make some use of these through the Moodle WebDAV repository interface.
BFC Networks apparently have a beta version of a Moodle-SharePoint plugin, though I would presume this will only be available on a commercial basis.