What are some songs that really utilize those lower frequencies?

Im Shinin' - The Pack (probably the most intense song on subs IMO)
A Milie - Lil Wayne
I Feel like Dying - Lil Wayne
Pass Me Da Green - Master P
Mikey (Rocks) - The Cool Kids

Granted most of this is rap, I just can't think of any other songs at the moment.

Let's hear it.

Blueberry Yum Yum - Ludacris
Damn - Youngbloodz

All I can think of right now, I'll try to add some more later.

Drop it like it's hot-Snoop and Pharrell
ummm.....When acting as a wave-The Dillinger Escape Plan

"It's 088 or an 800 or somethin like that. Somethin with that boom you know that bang?"

-Devin the Dude

slob on my knob- 3 6 mafia

not too low but shit bangs if u got a nice system

also danity kane- showstopper

shit old skool 2pac song named violent might be from the brenda had a baby cd.just to let you know it will blow your speakers and amps.
2pac all eyes on me 2 cd 3 or 5th song
westside connection shit always bang out

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any song when i crank the subs in my car up

late night tip, 36 mafia. bass i love you, basstronics i think. sticky icky, bizzy bone

Ya, but there are none that are just absurdly 'bassy'?

try godsmack, not too much ringing bass but alot of thump

It's Bigger Than Hip-Hop - Dead Prez

You know that Chapelle's show baseline? ya that's it.