I love the Toodledo interface, but I am afraid I will have to move to TaskTask since it has a native sync function with Outlook tasks (i.e., no upload to the web and download to the iPhone). I have to use Outlook because it is my company's standard and I can't have confidential information on your servers no matter how secure you tell me they are.
Anyway - best of luck to you and email me when you have a native sync to the iPhone/iPad and I will come back.
I don't like using apps that are no longer supported, but, I use Chromatic Dragon's Toodledo Sync ver 1.1.10 along with ContextMagic's Click Yes Pro which allows the Toodledo Sync to access Outlook without any user input.
With this setup, Outlook syncs every 15 min and every time I open Toodledo on my iPad or iPhone, it syncs. If I make a change on the iPad or iPhone, Toodledo is set to sync on exit. Then within 15 min (or sooner) Outlook picks up the changes when it syncs.
It's not going to get any better then that.
Of course, at some point in the future, there will be a hugely robust app for the PC/Mac/iPhone/iPad/iTouch/Blackberry, etc, that will sync immediately across all platforms. But, until then, I'm sticking with this.