I recently did some research on integration of Salesforce and AutoCAD WS. I wrote two articles earlier and published a series of English articles on ADN DevBlog. Post it now. If you are interested, please leave a message for me:
Getting started with Salesforce Development
Salesforce.com + AutoCAD WS Integration Research part2
Set up development environment and hello world environment Settings, getting started with development
Http://adndevblog.typepad.com/autocad/2012/05/integration-of-salesforcecom-and-autocad-ws-part-1.html
Eclipse based force.com IDE introduction Eclipse-based integrated development environment
Http://adndevblog.typepad.com/autocad/2012/05/integration-of-salesforcecom-and-autocad-ws-part-2.html
List attachments of case List of case attachments
Http://adndevblog.typepad.com/autocad/2012/05/integration-of-salesforcecom-and-autocad-ws-part-3.html
Pass parameters between visual force page and Pass parameters between controller VFpage and controller
Http://adndevblog.typepad.com/autocad/2012/05/integration-of-salesforcecom-and-autocad-ws-part-4.html
How to debug
Http://adndevblog.typepad.com/autocad/2012/05/integration-of-salesforcecom-and-autocad-ws-part-5.html
Transfer attachment to AutoCAD WS storage transfers attachments to AutoCAD WS
Http://adndevblog.typepad.com/autocad/2012/05/integration-of-salesforcecom-and-autocad-ws-part-6.html
Open DWG in AutoCAD WS online editor Open the DWG file in AutoCAD WS
Http://adndevblog.typepad.com/autocad/2012/05/integration-of-salesforcecom-and-autocad-ws-part-7.html
Apply the VF page to case layout to add the VF page to the case layout.
Http://adndevblog.typepad.com/autocad/2012/05/integration-of-salesforcecom-and-autocad-ws-part-8.html
If you are interested, take a look at the English version. If necessary, I will translate it again.