The idea behind the Plaxo 3.0 (Beta) is one that has value – a hub that syncs all of your online address books, calendars etc.
However, it only works sometimes. By downloading the provided software for your client, you can sync with Outlook and Thunderbird (contacts only), but with Web properties, it’s really hit or miss.
My Windows Live Hotmail sync point seems to work fine almost all of the time, but the Google sync point, which only syncs calendar and contacts (one way), does work half the time, and my Yahoo sync point has been in the process of synchronizing for 15 hours now. The only sync points that are 100% reliable are the desktop mail clients.
I realize the nature of Web 2.0 services are that they are perpetually in beta, but in this case, one the core features simply isn’t anywhere near reliable in a production environment. That’s more like alpha to me.