My favorite tool is my Ryobi Autoshift power drill.  It automatically shifts from speed to high torque when it feels it is needed making securing any fastener easy and fast.  Its almost as powerful as a impact driver just with out the impacting part.  Its also part of the Ryobi 18V ONE+ system of tools that can use any of three batteries (classic ni-cad, compact lithium, or high-capacity lithium) and works with over 50+ tools so you never need to buy another battery because they all are compatible. 

I hear ya man.  I saw an article comparing a Leatherman multi tool to a Swiss Army Knife in an old issue of Popular Mechanics (if I am not mistaken).  Looks like a very dependable tool, hence why you listed it in this discussion. 

My BFH!  Second place is a tie between the cordless Dremel tool and the 600 Foot Pound impact wrench!  MORE POWER! 

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I can almost imagine you laughing like a mad scientist LOL.  Power!  More POWER!!  WOOHAAAHA!  Hammers do come in handy.  My favorite tool is my probably right foot cause it takes the function of a "hammer" when I "nail" down on the throttle!!  Ha.  Plus I use to make nice music with my engine.  There's something almost majestic and soothing about a V-8 approaching its redline.