Salesforce.com officially announced today its acquisition of Indian web conferencing company Dimdim for approximately $31 million in cash. It is anticipated that Salesforce.com will integrate DimDim's features into their SaaS Chatter product.The Dimdim web site now allows only existing customers to login, with a note that new registrations are not being accepted. The open source community edition is still available for download from Sourceforge but will no longer be maintained by Salesforce.com. All free accounts are being shut down. DimDim was (is) a component of the Knowledge Hub (a projects I'm deeply involved with) and would have provided a free-to-use conferencing facility for Gov/Local Gov users of theThe Knowledge Hub when it is launched later this year. The full implications to the Knowledge Hub project are being assessed.