Plaxo is rolling out it's version 3.0 (beta) of their webapplication.
They've bought the group of young developers around http://hipcal.com/ , and my guess is that it's those guys who have played an active role in the complete rework of their webapplication.
Some points of interest.
- They support Open-id. Great to see another big player support it. Drupal was already rewarded for their work to support OpenID (http://drupal.org/node/162356)

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