Sortable Slideable Saveable (sss) is a class I wrote up that allows you to have a list of elements that can be sorted, toggled, and the state of each will be saved each time a change is made, either using a cookie or a couple of ajax / json calls.
It can be seen in action in my sidebar to the right. You can drag / sort them by dragging the icons, and you can toggle them by clicking on the title of each. Any changes you make will be stored in a cookie, you can reload the page and they should be in the state you left them in.
I will probably update this and provide some detailed documentation shortly. If anyone has any questions, let me know. Also if anyone has any input on how to make it better, let me know.