Please excuse my spamming, but I just put up a new version. See initial post.

It's "final", so to speak, as it does exactly what I need it to: It displays a jQuery UI Datepicker widget, then goes on to request a list of events from the server. If it succeeds, it will only mark those dates with attached events selectable.

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UncleCheese, in case you are reading this, I have two questions:

1) Isn't it bad to specify the ClassName in the URL for LiveCalendarWidget_Controller? Imagine I have a secret class that happens to have "Events" to it. LiveCalendarWidget_Controller would allow to get hold of this.
2) Would it not be better if Events(), by default, returns all events that have their EndDate after the selected start date, instead of their StartDate?

Great module either way!