Calendar App
I’ve just assembled a simple little calendar app using the jQuery FullCalendar plugin with relatively little difficulty. Here’s a taste:

At the moment, it only displays milestone information for a particular project, but we would like to be able to pull up all events and have the option to filter/display them. Furthermore, it is only logical that we link to particular milestone views and possibly have the option to manipulate the underlying information. Privileged dragging-and-dropping is really the only form of interaction at the moment.
If anyone has any other cool ideas for this, let us know, and we can try to cram it in by the feature freeze!