[2gumby2]

I'm also a fan of Sunn O))). It's the most extreme bass I have ever experienced. If your system can't get down to at least 20Hz, you won't know what your missing. This type of music isn't for everyone, but I dig it and it'll give your subwoofers a serious workout. I recommend the White 1 and White 2 albums, but I like all their music. There's another band called Weedeater, also on the Southern Lord label that has some good bass tracks. The name of that album is Godluck and Goodspeed. I would consider them in the Stoner Rock genre.

[jqp]

Great bass stuff here. 

Ohhh Yeeaah

[dflee]

One of my favorite albums for deep bass (double) is "Skip, Hop and Wobble" with Jerry Douglas, Russ Barenberg and Edgar Meyer. The second tune has a section of slap bass that is an incredible work out for any speaker. Harmonics of the dobro are something to hear.
Edgar Meyer also did a live album with Bela Fleck worth a try.

Don

[flintstone]

Some strong bass in this from "Archetribe"

http://www.amazon.com/Earthtones-Archetribe/dp/B00005UCBK

[K Shep]

And now for something completely different.  Uberzone is electronic, not for everyone, but this is great CD and the recording quality is exceptional.

http://www.amazon.com/Ideology-%C3%9Cberzone/dp/B000TGGJRS/ref=sr_1_1?ie=UTF8&s=music&qid=1247448416&sr=1-1

[Big Red Machine]

You guys are costing me money!!

[roscoeiii]

Well Big Red, good thing I just sent you some money. Don't spend it all on deep bass CDs. Or heck, go ahead and spend it on bass CDs. They are a durn worthy cause.