This issue was occurring with both v1.0 & v1.1 of the iphone software.
I am currently using a gen 1 iphone and am syncing to an online free toodledo account. I have created many tasks with both the webapp and the iphone app and am getting the same results.
When I look in the "Due-Date" tab under today it is listing tasks that are not due until tomorrow (10/15). When I look in tomorrow it lists tasks for 10/16. It's like the application this it is a day ahead or something. The iphone is currently managing the date and time automatically. I thought originally that maybe was an issue with the priority so I changed it from Top => High, and it did not make a difference. I have even deleted the app and reinstalled via the app store and the issue remains.
If I look up the web app under the "Due-Date" tab everything is listed correctly under today, tomorrow, etc...
As far as the tasks go, they are associated to a folder, context, and have a priority of Top.