From their site: This API will allow 3rd parties to programmatically synchronize information, address book, calendar, with the Plaxo network. It is also possible for a 3rd party to develop their own Plaxo client which integrates with a contact management application that Plaxo does not support natively. The API currently supports Plaxo-enabling an address book. Calendar, tasks, and notes are not supported yet, but may be added in the future. The API is currently available as a Representational State Transfer (REST) Web Service.
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There are no source code libraries or how-to links for Plaxo. If you know one why not add it?
Yes, the Plaxo API can be used to build a synchronization software with Plaxo service.
As an example please see smartLookup application at http://lookup.smart4smart.com
This application allows synchronization of Plaxo folders with java-enabled mobile phones.