I spend a lot of time in tasks. I could get the same amount of work done in a lot less time with a couple UI tweaks:
* One edit screen, not two: you have to click edit from the activities dashboard to view/edit a tasks, then click edit again from the task window to edit (other than adding a note). Each of the editable fields could just as easily be accessed from the first task screen.
* Reuse info with "Complete and Create Another" Contact, Deals & Tags should all be duplicated in the new task.