If you are a teacher using Microsoft Office for Windows to produce content for Moodle, then you might be interested in Microsoft's latest product for Moodle.
They've produced an Office Add-in that allows you to open Word, Excel and Powerpoint documents directly from Moodle, and also to save your documents straight back into your course files area - bypassing the Moodle web interface completely. (Note that such Add-ins are only compatible with Office on Windows, not the Mac OS X version).
They've done this by calling Moodle web scripts directly which is probably not as stable as using web services designed specifically for this purpose (such as the ones in the upcoming Moodle 2.0), but their approach does have the huge benefit that it works with any recent 1.x Moodle out of the box with no modifications to the Moodle site.
See the Office Add-in for Moodle page for more details.
