Did you need to bump this one year old thread? I think you could have made your own instead of doing this. That is alright though, you have a question that needs to be answered. The issue with the PS3 copying music to any external device is that it will want to put the music in a MUSIC folder. Most drag-and-drop compatible players still need to have their music in a certain folder in order for the device to play the files. To my knowledge, Sony portable players are the only ones that support the MUSIC folder structure. The issue with Sony players is that they aren't friendly on your wallet and they don't really have that many features. Sony has yet to introduce a video compatible "Walkman" branded portable yet video playback has become the norm in devices. You might want to look at a SanDisk portable player as they support the drag-and-drop feature but the files might have to go into a specific folder. I can't really remember as I have a 4GB SanDisk Sansa Clip but it is packed up as I am going on a trip soon.
Another inexpensive option would be to purchase a new PSP-3000 package for $200 that comes bundled with a 4GB memory stick. That is about the price of an inexpensive player these days and the PSP has more features than any $50-$200 player on the market.
I don't think its a big deal to resurrect this topic. If he started his own, we'd the opposite ("why didn't you search the forums to see if the topic already exists/was already addressed?"
What are some of the models we're talking about when we say "Sony drag and drop"? Is it these?