Thanks for putting this together OP. Very cool idea, especially with the voting.
I'll add my +1 to:
Magnetic parts trays
blue mechanics gloves
1000lb engine stand
black tool cart (if it's the 4 drawer)
And a -1 to:
3/4" ball joint separator - Mine stripped its threads out on first use, which was on the tiny ball joints from my Thunderbird.
Since starting the current job, there have been some HF gems I've found out about, and used the hell out of on a daily basis.
2-in-1 Adjustable Wrench
8" long and can expand to 1-5/8" (markings only go to 1-1/2"). Invaluable if you work on heavy equipment hydraulics (big fittings and tight spaces).
http://www.harborfreight.com/2-in-1-wide-mouth-adjustable-wrench-67128.html
6 Piece SAE Jumbo Angle Wrench Set
Another tool that's awesome for hydraulic work. Makes me wish I had bought these over my Northern Tool Jumbo Combos years ago.
http://www.harborfreight.com/6-piece-jumbo-angle-wrench-set-34842.html
28 Piece Transfer Punch Set
Never even knew these existed, but have used them almost daily at work, and have held up great.
http://www.harborfreight.com/28-piece-transfer-punch-set-3577.html
5 in. High Speed Air Sander
Will remove a lot of material (and metal) scary fast.
http://www.harborfreight.com/5-in-high-speed-air-sander-68739.html
1/2 in. Quick Release Impact Extension Bar
Works great when using a socket in a space where if it flies off, you're going to be spending some time with a magnet to retrieve it. I bought one of these the day after that happened.
http://www.harborfreight.com/10-inch-quick-release-impact-extension-bar-98208.html