Yes, Franklin Planner (nowadays Franklin Covey) has software that works on the Axim, called PlanPlus for Outlook. They have a 30 day trial version. It works smoothly with ActiveSync and I have been using it now for about two weeks without issues, except for the occasional unresolved item. For previous Franklin Planner users it should be a huge relief to be able to finally sync your outlook with your paper planner (which of course is not paper anymore!).
http://www.franklincovey.com/planplus/download.html
I also purchased the universal handheld binder with the spring clip and it works great.