I just installed and used this utility and I must say that I'm a HUGE fan of saving time (it is money!). Go here to download it. This add-in will add a menu item under your tools menu so once your BizTalk project is highlighted you can create an *.snk file.
To install the add-in, just compile the add-in project and add the *.add-in file and assembly into your Addin folder (Ex. C:\Documents and Settings\\My Documents\Visual Studio 2005\Addins\ ) and open VS2005 and goto your Add-in Manager and add it. This works for VS2005 and BTS2006.
Great job Jon and Carlos.
-B