Ooooh. I love these ideas! Thank you all so much! I can't wait to see what else comes along...

After chatting with the lovely and gracious cariad, I have decided that this task jar will be my husband's birthday present. That's October 8th, so I hope that'll prompt some of you to help chip in with suggestions. I'd like to be able to give him a jar stuffed full of ideas.

Please don't feel the need to limit your suggestions to household tasks, either. Although, I must say I think housework is going to be much more interesting soon.