Pocket Informant can sync perfectly with Toodledo and you can use either Google Calendar or native one, no matter if it's iOS, Android or BlackBerry platform. Even more, you can use both together (native anf Google) or create a new one from inside Pocket Informant (or more than just one if I remembe it well). This app is the most versatile and adaptative from 3rd party tools that use Toodledo for tasks. In my opinion, it could be much better but, even so, by now, it's the best you can find. And I'm just a user, not paid to speak well about Pocket Informant, as it could look like! LOL