In SQL 2008, if you want a specific user to be able to execute any stored proc (existing ones and newly created ones), you can do this:
GRANT EXECUTE TO <user_name> --there is no "ON" clause
SQL DBA,SQL Server MVP(07, 08, 09) Prosecutor James Blackburn, in closing argument in the Fatal Vision murders trial:
If in the future, you should cry a tear, cry one for them [the murder victims]. If in the future, you should say a prayer, say one for them. And if in the future, you should light a candle, light one for them.