I personally developed some code to use the new REST API for myself then did a drupal module for a few users that paid for it but happy to contribute this back to drupal under the GPL now :)
I'm in communication with the existing developer David Konsumer by email and he agreed to let me co-maintain this module:
http://drupal.org/node/638640
I think he had problems integrating the new constant contact REST API and reached a dead end but did plan to update it one day he said, the new code is not compatible with the old code so we will have to fork it off and start new.
You can see a description of the new module here:
http://integrationservic.es/drupal.php
That site will be changed to provide installation services.
I've also been communicating with some other drupal developers who say this is the best way to approach the problem:
http://drupal.org/node/229996
Thanks.
James Benson
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