One month ago, I bought a Creative Zen V Plus mp3 player. It's a nice player but I missed easy to use access under Linux (I don't use Windows anymore). I tried the libmtp project but I did not like it much and so I started RubyMTP project. It's a Ruby library to connect to MTP devices. For now it provides a filesystem access using Fuse and a podcast application. It need some test so if you feel like it, give it a try.