What is your most used app? For me, it is a tossup between Pocket Informant Pro (calendar, task, contacts), Downcast (podcast aggregator and player), and MotionX GPS Drive (turn-by-turn navigation). Granted the last two get the greatest duration of use by the nature of how they are used, but frequency of use goes to PI Pro. Now, none of these are my favorites, per se in that I don't really enjoy the app itself (you would have to have some freaky calendar fetish to enjoy using PI, Downcast can't be credited with the quality programming provided by CNET, TWiT, or NASA, and although I am a confessed map geek, MotionX's value to me is all in its utility.) I am, however, absolutely hooked on the functionality of these apps to the point that I use them many times in a day.
What apps do you find have such a hold on you?
What apps do you find have such a hold on you?