I'm new to this and testing it out still. Looks quite nice so far.
I would like to see a more sophisticated category system. Moodle appears geared for a particular institution or individual providing online course material. I am looking to create an online system that allows from any institution or none to create online course material and the way the current category structure is set up this could get messy.
I would also like to see a "Link" item be added to the Add menu (the one that includes assignments, choice, forum, etc). This would allow you to create a simple link rather than an article that includes a link (the would be especially useful for the main menu section).
If these things are already possible and I'm missing something, please let me know.