1) create a master folder. (ex:Fuxxwiddit.Music)
2) In that folder take all dance tracks/dj music and run them in Mixed in Key so it changes the id3 tag with the key and bpm.
Then take the tracks that you downloaded that day and put them into a folder for that day “ex: 8.24.12” after that I take that folder and put it into a folder by month (ex: Fuxxwiddit.August.2012).
Master folder > Month of the year > Day.
Then I import them all into rekordbox.
(A friend just recently hooked me up with a free Macbook Pro so I might consider making folders in itunes but that might be a little over sensitive)