I recently attended Drupal Camp Alberta with about another 50 people. The reason for my attendence was that I had been invited to speak about the drupal services module as one of the co-maintainers of the project.
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Currently we are carrying out a piece of integration work between Drupal and Salesforce. Drupal is responsible for pulling the data from Salesforce and this achieved by calling the SOQL api via a webservice. The data is returned in a SOAP format. This article assumes you are using this salesforce client