The main use of the MP3 are not for Club DJ's (Club DJ's use Vinyl mostly, and if not that, audio cd's are the standard). They're mostly for the Mobile DJ's who happens to need more music styles in a CD. CD cases are also heavy when you gotta do a 70's party, an 80's on the next day and play hip hop in the club on saturday. It's hard.
MP3 is a resource, a technology to be used, like any other technology avaiable, that any player should have and must have, in my opinion. The new line of Car Stereos from Pioneer (for example) have only ONE model without
MP3 support nowadays. I see the adoption of MP3 extention a inevitable fact. All brands are also turning to the same standard, because audio cd's are going out of fashion. However, massive devices does not play MP3 and that's why audio CD's are going to be with us for a long long time. Numark is creating a double-deck that has internal hard drive and USB 2.0 support, so as you can sincronize MP3 with your computer and also "upload" to the device your brand new MP3 files. Sounds like portability and versatility to me.
I organize my MP3's CD's by style, and i use 100 tracks per CD. I use a printed tracklist in each CD and i use a Palm Zire 71 to catalog those CD's, using Repligo 2.0 (from Cerience) to convert a Word file (tracklist.doc) to it, and when i need a track, i search tru it.
About the Denon DN-S500 Spinnin Platter:
It's a little bit loose, that's true, but it's not weird. It's just a matter of getting used to it. It's ok to use, trust me. It's seems toy-like because the platter is small
and that's weird to look at it. I also bought denon because of the MAIN SIZE of it. Transportation would be less complicated when a device is not as big as a Technics SLDZ or CDX.
But the feeling of throwing the little disk into the mix is inquestionable nice.