More to come as I'm doing this from memory:

Small open end wrench set
3 picks (straight, right angle, curve)
1/4" nut driver 10" length plus an entire nut driver set
Small socket set
Contact cleaning tool (not nail file)
Switch adjusting tool
Molex round pin removal tool .156
The longest #1 Philips head screwdriver you can buy (PM me for details as I'm not near my tools now)
Plastic pry bar set
Mulimeter with a good set of test leads including alligator clips
Needle nose pliers (high quality)
High quality crimper for .156 Trifurcon style terminations
Allen or "hex" key sets in both metric and sae (don't buy the ones that fold up, get the "L" shaped ones
Mini socket wrench set (the ones that are really tiny and have an adapter that fits into wrench to use in tight spaces...only goes up in size to 3/8ths or so)
Right angle Phillips head and flat head screwdrivers
Soldering iron station (search forums for a decent one)
Solder "sucker"
LED light that straps to your head
Small jewelers hammer
Pin punch set 
Magnetic retrieval device (telescoping)
"Grabber" retrieval device (punch button and "fingers" pop out other end to grab stuff in tight places)
Telescoping mirror
Plastic razor blades
Fuse puller tool (not the little yellow one)
IDC wire insertion tool
Bulb removal tool
3,000 RPM electric drill
Channel Lox adjustable wrench
Flipper gauge
Feeler gauge set

Adding to my list above:

Jewelers screwdriver set
Heat sink for soldering
Forceps of various sizes for holding wires while soldering
Spare alligator clips for holding wires while soldering
Titan ratcheting magnetic screwdriver - note, shaft is 6.5" (mentioned above, link below)
This screwdriver is very high quality for the price and you can add any bits you want: 
- bits to remove cap screws on flipper mechs
- bits to remove hex head screws (even unslotted, as the screwdriver had a socket adapter)
- bits for star screws, security screws, etc., etc.
http://www.amazon.com/Titan-Extra-Long-High-Torque-Ratcheting-Driver/dp/B002R68AN4/ref=sr_1_2

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