Historical clue formulations

• It has a sticking point — 2008-07-11
• "Is this a ___ which I see before me": Macbeth — 2006-07-09
• Cloak's partner — 2004-04-20
• Blade — 2004-02-26
• Stiletto or dirk — 1999-08-03
• Macbeth's weapon — 1999-03-07
• Sticking point? — 1997-06-26