When you go to import your address book, one of the choices is to import from Plaxo. This is a great option if you are a Plaxo member and your phone is already synced directly to Plaxo or indirectly via Outlook or Mac Address Book. You just need to type in your Plaxo account email and password.
After the initial import from Plaxo, you will see a new link appear in your Skydeck address book (to the right of the NEW CONTACT button) called ‘Sync to Plaxo’. Click this link to sync Skydeck to Plaxo whenever you wish.