i can offer my advice for cool kick sounds, although this is probably not what got the kick sound in dirt off your shoulder. my main technique:
vinyl kick sample + analog filter = cool kick sound
vinyl kick can be replaced with the recording of a live kick drum, with the right mic (some dynamic mics such as the akg d-112e are meant for kick drums)... i usually like to run live kicks thru an analog filter and then an analog compressor (
bbe maxcom compressor, includes a "sonic maximizer" which is cool for live drums). for vinyl kicks, i only use an analog filter.
analog filter can be replaced by a good digital filter (izotope trash has good ones)... use a LP filter but dont go too low on the cutoff, maybe add a lil resonance (but not much) to get the treble frequencies to pop out a bit right before the roll-off. with the right filter this adds a subtle sort of shaping that can work well.
often i put a lil eq on the kicks. rarely do i mess with funny fx like reverb or chours on a kick, but sometimes i like a little subtle tape-modelling distortion (many plugins can do this well).
hi-tek has some good kicks... often he samples them from vinyl or live drums, and layers them with 808 kicks... with the right eq combinations, you can get these to fuse really well. another good layering combination is vinyl kick + sample of bass note from analog synth (saw or square, LP-filtered down, fast decay and no sustain on VCA envelope).
cool article which details what El-P and Hi-Tek like to do with their sounds, including drum sounds:
http://remixmag.com/mag/remix_bomb_tracks_hiphop/index.html