I've enjoyed reasonably good results from using HTML::CalendarMonthSimple, for what it is worth.

There are a few things it doesn't do gracefully (like suppress content on weekends) but I think a few updates will take care of those sort of features. I plan to suggest a few of these improvements to the author in a couple of weeks. If you end up using it, perhaps we could collaborate and come up with a list of suggested features and some code that would implement them.