Samsung Galaxy S :: Contacts Groups Not Syncing To Phone

I've got a Galaxy S and am really pleased with the phone generally except the contact management is really frustrating. In particular I can't seem to sync my Google contacts groups. The contacts themselves sync ok but they are all grouped under Google in the groups dialogue. There doesn't seem to be any way for me to add them to groups I create on the device or to get the groups that are in my Google contacts to display. Annoyingly if I try to create a group on the device with the same name as a group in my Google contacts it tells me that a group of that name already exists even though it won't display that group on the phone.