This is one of the popular requests, unfortunately its
not going to be in Katmai. A number of people have done it through Redgate being
the major guys. However I came across Seans post about his snapshot Addin
( I would love to see the code Sean)
http://sqlblogcasts.com/blogs/seanprice/archive/2007/07/15/sql-management-studio-snapshot-add-in.aspx