I mean it: this should be your primary TODO list, always up to date and in roughly the right order. Whatever you're working on should be at the top. Here's my TODO list: http://img.skitch.com/20100712-nkc6q1syeimrci8d56b8c9dyy4.png
I started doing this as a coping mechanism to let people know how much stuff had fallen on my plate and to make sure they knew I hadn't forgotten about their requests, but it ended up being very helpful for us to know what everyone is working on.
Try it out and let me know what you think.