*Necro of Awesomeness.*
Anything by EMINEM.
When I run, it's with 808 State - they have a bunch for free download here.
I don't like training to metal; I need something with rhythm. Maybe it's just because I'm used to training to R&B and hip-hop.
Occasionally some different stuff will get mixed in. I remember one particular instance in the middle of jiu-jitsu when "The Chain" by Fleetwood Mac started playing. There was some awkward silence and laughter before someone near the stereo hit next.
"Oh Timbaland" was the first song on my coach's playlist for quite a while, which he would start at the beginning of our warmup. Whenever I hear it now it still gets my blood pumping.