Welcome to a new year.
I recently installed the DE 5.1 sound card. Very impressed. 3 days ago I added an analogue 5.1 speaker system, and have now realised that a 4.1 setup would have been okay. The sound card is basically a 6 channel sound card. One port for front satellites, one port for rear satellites and one port for centre speaker and subwoofer(with it's own bass control knob on the DTT2200). The first thing I noticed is that the centre channel does all sound, no matter what channel should be voicing the sound(tested this in Deus Ex, maybe other programs will take into account the 5.1 setup and shut centre up) this means that sounds coming from behind also come through the front speaker. Bad for Thief gamers.
The digital DTTD3500 speaker system plugs into only 1 port on the card(same port as the Centre/Subwoofer). The decoder then sends to each individual channel. I think it comes with 18" tripods for the rear speakers too. The DTT2200 doco says you can order these through creative.com, but I just wasted an hour or 2 on that site and found nowhere to buy them. Gunna get the Kiosk stand anyway.
Conclusion: 5.1 is great for movies, but unecessary for surround sound gaming. Oh, and beer is good!
The only stupid questions are the unasked questions.