I am one of those palm to pocket pc converts and currently use a T-Mobile MDA. It would be nice to gtd on the pocket as much as possible like the outlook addin does.
Maybe you could team up with developerone at www.developerone.com ? They have done a very fine masterpiece of PIM which uses the original pocket outlook data. I guess there wouldn't be too many enhancements to their software to get something which is the pocket pc equivalent of the outlook addin.
Just an idea, put in on your projects list and not into someday/maybe