I may have found a bug (was using 2.2.3, but moved up to 2.2.7 and still happens) or I may have a dodgy phone.
In KA/Pi, when I elect to Beam Selected contact to my phone there's no problem, ie the "Sending..." thing happens on the Zaurus and my phone asks, "Receive Contact Blah, Blah?"
In KO/Pi when I tap and hold an appointment and select beam, the Zaurus says it's sending the data (and completes) but there's no response at the phone.
Just to check, the phone receives any kind of beamed document/data from the Documents or Files tab without problem
Just in case it's a localised phone problem it's one of those HTC Jam Phones.