Hi Chris,
No our Windchill and SharePoint are not integrated. We use SharePoint for our corporate intranet. We do put documents out there but more from a sharing standpoint. We do have documents that we put in Windchill, but those have one of two purposes. 1. We have a workflow for approval signatures or 2. we are directly relating them to a workflow document or an end item/part. There are a couple of instances where we have overlap because not everyone has access to Windchill.
Brian