I just finished a more-thorough-than-skimming but less-thorough-than-reading look at the todoMatrix user's guide. I have never been tempted to buy a task management app, e.g., PocketDay or bbToday, for my BlackBerry simply because they added little to no functionality. They do little more than re-skin the built-in app.

todoMatrix appears to be a complete rethinking of task management and it looks very exciting. I'm still using the trial, but I may very well end up buying it when it's all said and done. I'm giving heavy consideration to ideaMatrix and impactMatrix (which isn't yet available but looks promising), too.