I use a program for todo's that is great, it's by RexWireless REXwireless: BlackBerry Software Applications
Their ToDo Matrix has an option to "Inject into ToDoMatrix". You can inject emails, contacts, notes etc... It's something like $50, but I have not found a better task manager for the Blackberry. I used it with the 8703e and now the 8830. I can't help you with a cheap/free solution, but if you try a few of them you should give Todo Matrix a look too, they do have a free trial I think.