I'm looking to develop my own task application so I'm trying to study the UI of any possible in-browser apps that have some sort of functionality which has an ordered list where items can be tagged as "done" and they either get color-highlighted or move into a "DONE" column.
By the way, the area would be a tinyMCE or similar editable area and not some primitive html rendering.
Example:
The To-dos section of www.basecamphq.com