Anyone interested in tasklists and using EMACS should check out ORG-mode (which is built into emacs). It's by far the coolest implementation of TODO-lists I have seen.
here is a feature list with pictures!:
http://orgmode.org/features.html
here is a good intro video for it [18m]:
https://www.youtube.com/watch?v=fgizHHd7nOo
I like it and think its cool, but I don't use it much yet. (What an endorsement!)