David Higgins, one of the Axosoft developers working on various projects, has put up a great new OnTime SDK sample showing how you can integrate OnTime 2007 and Outlook 2007 tasks.  Updaing tasks in one place automatically updates the other, even OnTime specific fields show up in Outlook.  This sample is really great and includes all the source code so you can take the Outlook integration much deeper if you wish.  It's also a great starting point if you want to write other types of Outlook integration (such as email) with OnTime.  Here is the article with a link to download the code:

http://community.axosoft.com/blogs/davidh/archive/2007/04/19/ontime-2007-outlook-2007-tasks-and-your-pda.aspx

Using this integration, you can get OnTime tasks synchronized with your Windows Mobile Phone or PDA.