I've been using GQueues for a couple of years now and would not want to give it up under any circumstances. For anyone whose life revolves around a GMail in-box, this is the To Do app you want to adopt. Its integration with GMail and Google's calendar is very slick. So slick, in fact, that there's no longer any excuse for me to have anything in any of my in-boxes for more than a day.
FWIW, I have created a set of daily recurring tasks: e.g., review calendar, clean out in-box 1, clean out in-box 2, review To Do list, etc. I run through these at the start of the day and, once I'm done, I'm ready to tackle all the tasks that were created as I cleaned out my In Boxes. And throughout the day, I add tasks using the iPhone app. The result is an ever evolving list of everything I need to get done. Brilliant!