I'm talking about the Sneaky DS. I currently use a laptop with the Linn GUI software to control it- you can load up a playlist and then use a standard Linn remote (not supplied with the Sneaky) to skip tracks, pause and so on. A 3rd party developer is writing some software for the ipod Touch though which looks promising, or there's already some software which runs on a Nokia N800 Internet tablet (although this has some limitations around gaps between tracks), Linn recommend you use a NAS for storage but I'm actually using a Sony Media Centre PC with a 1Tb hard drive and Twonky media UPNP software.
My main set-up is all Linn- Unidisk SC as pre-amp, 2 x 5125 poweramps, Ninka speakers (tri-amped) and a Seizmik sub. The other Sneaky is connected to a Meridian pre / power amp with Ruark Sceptre speakers. I've compared the Sneaky's sound to both the Unidisk SC and Meridian 507 CD players and it is significantly better in my view with classical music at least (which I listen to exclusively).
There's a great deal more discussion about the Sneaky at http://forums.linn.co.uk
Jeremy.