I would really like to have my completed tasks stay visible... maybe with the tex crossed out, and locked to the date that it was completed.

Can this be done?

I want this for two reasons. I would like to be able look back and see when I completed a task, also, this would give positive feed back, as you see the list of things COMPLETED, and not just a growing list of things to do. This is also a help for people with ADD.