PocketMac's OS X sync software was bought by BlackBerry, it's a free download. Missing Sync for BlackBerry is made by the same team that produced Missing Sync for Palm -- which we've used for a couple of years. That software costs $40, but I'm eligible for a $20 side-grade.
Both require a USB connection, they won't work with Bluetooth. Both come with ominous warnings of known issues. Only the PocketMac product supports direct software installation, but most BB software seems to be "over the air" anyway.
PocketMac seemed cruder, and it doesn't use a standard OS X installer. That makes me nervous. Sync software is ugly stuff anyway, non-standard installers add risk to risk.
I paid the $20 to MarkSpace. First sync had lots of warnings and issues, but at least the address book sync worked. There's no way a non-geek could ever use these products.
BTW, Missing Sync for BB is not a very trusting product. You must register over the net, and it stores your ethernet card address. One machine only!
No wonder everyone's afraid of the iPhone.