I would LOVE to be able to assign each list a color. I'm very visual and easily get frustrated with a long list to do each day. The tab could be colored in the "Tasks" view. The task itself would be colored in other views that use combined lists and are grouped by date (Overview, gmail add-on, igoogle gadget, mobile, etc.). Then each day when I look at my list to do for the day, my errands would stand out as yellow, my deskwork as green, housework another color, reminders could be red, and the recipe for supper that night another color. It would make a long list of tasks not seem so overwhelming and mundane and make it quick and easy to see what you need to do next.
Thanks.