iSync will be out of beta when it's ready. Or actually, knowing Apple, it'll be released just before it's ready, then be followed quickly by a .01 release.
To be of true value, iSync has to seamlessly connect to as many devices from various manufacturers using a multitude of platforms as is possible. I'll forgive it if it doesn't talk to Pocket PC devices in the 1.0 release, but it had better talk to all Palm devices (from Palm, Handspring, Sony, ...) via USB/Bluetooth/IrDA, and all SyncML compatible cell phones.
If it doesn't, it's just a cheap gimmick to support tie-ins with Palm and Sony Ericsson.