Some things we've dealt with: Don't put too many songs on one CD, unless you print out labels and make the track name readable. It's hard in a dark club in the heat of mixing to find tracks on 200 hand written CDs with sloppy writting. Make doubles, so if you want to mix into a song, that is on the CD in the player, you have another copy to do it with. That way you can also phase, flash and remix on the fly, Drop accapellas, breaks, etc. Def make doubles of every CD. Be picky about what songs you put on disc. You might think that putting every single track on CD will only add to your options, but lets face it, Some tracks that you bought online suck, got destroyed in the coversion, or won't ever work in a set. Its good to have options, but not toooo many options. Can slow you down sifting through shit. Group the tracks if you can. Have tech house on a few, prog on the others, etc. If you have them roughly together, it will be easier to pick tracks to mix, and you will find them faster. Put a symbol on the disc that will help you remember which CDs have your favorite tracks. If you are flipping through a CD case looking for a single track on 200 CDs, it can be a pain. But if you are looking for a symbol, say a star or question mark, you'll know right away that your track is on that CD. Especially in a dark club. You can flip through the book fast looking for a symbol instead of reading every single track name. Hope this helps. We have gone through many iterations of our main play CD collection. Started out with all of them, then cut it roughly in half, now really only play about 20% of them regularly, not to mention cutting out old ones with the new ones we buy. You can buy 10 tracks online for the price of an import record, that means you have to remember 10 times as much. If you have a plan and stick with it, you will always be able to find your tracks quickly while in the mix. Best of Luck! -T