I'm interested in Marc's comment that he only grades assignments uploaded in PDF. I'd like to do the same, but I'm not sure I can get the IT department at my institution to install PDFcreator on all lab computers, and students don't have administrative privileges to download and install software on university machines. It's a real concern here, since relatively few students have computers and those who do have no internet access or dial-up and would be doing their moodling on-campus.
I don't know how to code, so it's hard for me to figure out of this is possible, but I'd like to see a mechanism whereby students could upload, say, a Word file and Moodle would convert it to PDF for the instructor to view... something like goBCL
(unfortunately, not opensource
This might be appealing to the server-side folks, since pdf files are often more space-efficient than (bloated) Word files!
Just a thought.