I have made some modifications to the BizTalkGenerateStrongName tool developed by Jon Flanders, for more info about this tool please visit his post "Another BizTalk development tool".
The principal change is set the new property value to all BizTalk projects in your solution, additionally include:
.- Copy the existent values of one BizTalk project to all BizTalk projects in the same solution
.- Override the property values in all BizTalk projects
.- Besides to edit the Assembly Key property, you could set a new value to Application Name property in BizTalk projects
You can download the project from BiztalkGenerateStrongName: Workspace site. This tool works with VS 2005 and BTS 2006.
Thanks to Jon Flander to let me publish these modifications.