There is a previous discussion
(http://moodle.org/mod/forum/discuss.php?d=128484)
That talks about constructivism and includes links to quite a few nice resources.
This gist of it is that students learn best when doing as opposed to passively observing. So you should use Moodle as a means to manage/encourage/foster activities that involve the students performing tasks and actively engaging rather than just as a means to present material and then assess.
Teaching with Moodle
teaching meyhodologies
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