Two short things… First, as noted by mr. David Kromek, if you ever used a PDF printing software (like doPDF or PrimoPDF) to convert a Math-o-mir document into the PDF format, you maybe noticed that equations and graphics looks much smoother in the PDF reader than in the Math-o-mir itself. I just wanted to mention this fact in case you are concerned about look of your documents. The PDF format is also displayable on many platforms. So, there is no reason not to try.
Second, the FileDen file sharing service seems dead for good. They are not answering to my mails. This situation lasts for three weeks now… I am searching for a new file-sharing service that is free, allows direct links to files, quasi-unlimited storage time, and is simple to use. Tell me if you know a good recommendation. Thanks.