Is it possible to use the Salesforce API to get an object's internal salesforce id. For example this id appears in the URL for a custom object setup: https://cs15.salesforce.com/ID?setupid=CustomObjects
Update; I used the tooling API with this query to get the object DeveloperName + the internal SF Id:
/services/data/v33.0/tooling/query/?q=SELECT+Id,+DeveloperName,+ExternalName+from+CustomObject