I just bought Mark / Space’s the missing sync for the pocket PC. I am now using it to sync my HP iPaq 1945 with my iMac. It works as advertised. I like that I can sync avantgo now without having my work laptop at home. It also does bluetooth syncing. I love that. It was kind of pricey at $40 something, but it is really cool.
I also have their palm sync product. It is good, but I am having problems with the avantgo sync with my Treo and the iMac. I need to find time to work on that issue.
So far high marks for Mark / Space and their products. Makes owning a Mac less stressful knowing you can use more hardware with it, (i.e. my pocket pc and palm) without less features than I would on a PC.