Addidtional to webform module for reposting data

I don't know of a particular contributed module that provides this functionality, but a lot of users have implemented it as custom modules. There's basic documentation on how to add extra submit handlers to Webforms in the handbook: http://drupal.org/node/1291574

And you might look at some of the other modules out there that send Webform data to external systems:
http://drupal.org/project/webform2sugar/
http://drupal.org/sandbox/evandonovan/1198324 (salesforce)

A new module was written a while back that provides this now: https://drupal.org/project/webform_remote_post