A thread like this seemed interesting to me to learn from how others do it & maybe even refine and streamline your own workflow.
I'll start off myself. Please reply in a (more or less) similar fashion.
(1) I use MixMeister BPM Analyzer to accurately determine the track's tempo.
(2) The Mixed In Key software determines the key of my track.
(3) I import the track into Ableton Live and warp it.
(4) I organize my tracks according to the key I found in 2, so I can do some harmonic mixing.
(5) I chop the track up into several loops, as you can see here:

The number in front of the name tells me how long the loop is (64 = 64 beats = 16 bars)
The letter at the end will tell me if it's OK to repeat the clip or not (R = repeat / NR = no repeat)
The description of the clip is kind of self-explanatory. I also maintain the same color code in all my tracks, so I can instantly recognize everything.
(6) I try to extract as much additional loops out of the track as possible. Like vocal samples, short instrumental loops. If the track contains longer vocals, I'll try to find the acapella and save it with the song. Those additional loops will be used to mix into other songs to create live mash-ups.
That's pretty much it.
Hoping to see some interesting answers. Thanks in advance.