I hope you take a look at Pocket Informant then. We've were showing off our software catty-corner to Things at MacWorld and we got such a tremendous response I wish we had final software to release, not beta in-development stuff.
Our philosophy is that it has to be dead simply and we've been doing mobile software for over 8 years now, so we know what the issues are with mobile interfaces - especially mobile interfaces designed by desktop developers.
We design our software focused on the platform we use - BlackBerry, Windows Mobile, iPhone - and I think it showed to most people. A lot of people came by and looked at our software and how it integrates the calendar and tasks with a GTD concept (or Franklin Covey if you prefer) and told us that they were looking forward to it because we really focused on that ease of use factor compared to other GTD apps. $12.95 is what we're going for with a free Lite version when we ship at the end of the month.
http://www.PocketInformant.com/