1979 Oldsmobile Delta 88 (color: Grandma Blue):
Sanyo tape player (the kind with the dual knobs)
3.5" Infinity Reference dash speakers powered by the head unit
Majestic 100 X 2 amplifier (older model, had a pushbutton for bridging)
2 10" Kenwood subwoofers (bought at a pawn shop, not sure how old) in a ported box (homebuilt). And by ported i mean two 3" holes cut in the box, no ports...lol
The 2 10's were replaced by a single 12" Kenwood sub (bought new at a PX at an Army base).
The amp was upgraded to a 100 X 2 Profile, the white one's with the long red power strip. I loved that power strip, had a neon glow to it. :)

In one of my ex-gf's car (92, i think, Plymouth Sundance):
JVC tape player (not sure on the model #)
6" Pioneer mids powered by a 50 X 2 Coustic amp
AudioControl 2XS 2-way crossover
2 12" MTX Blue Thunders in a sealed box, run off that same Profile amp as above.
I ended up selling the subs and profile amp for money...

In my current car, an 89 Toyota Corolla, i have done many things to it, stuff i never would have imagined doing to my car. I'll just give a quick rundown as there is a page detailing this vehicle's transformations over the years.
Clarion 7575z Cd player
AudioControl 2XS (same one)
Kicker ZR240 pushing a set of Hifonics 6.5" Olympian Warrior components
Cadence A7HC pushing three Shocker15's in a ported wall behind my front seat.
Lightning Audio 1F capacitor, and Lightning Audio power and ground distribution blocks.