Selenium Future
Currently testing works on Mozilla and Camino, IE and Safari. Any other browsers require a browserbot modification but should be relatively simple to implement. IE Does work, however it is not completely reliable when running it remotely. I was receiving permissions errors in the javascript.
With the drag and drop functionality there is a bug in Selenium that needs to be fixed that times out javascript in the browser when you try to tell Selenium to drag a div on top of another div. At first I thought it was just slow and followed the forums help with the error by configuring firefox's javascript timeout to be 20 instead of 5 seconds, this however did not fix the problem.
The solution is that drag and drop needs to be given coordinates, as to how far to move and in what direction.
Wrapper: Since I am using javascript functionality to directly call the Cal.eventRegistry there is a possibility that this might change and a wrapper is needed. I am working on a javascript function I can add to Selenium that will allow us to make the change, when and if it happens in this function once instead of modifying each test.