While doing research on surround sound we found an interesting podcast on Dolby's site. The podcast is hosted by Craig Eggers, a 20 year veteran in the audio field, and Jack Buser, a self proclaimed "Worldwide Technology Evangelist." These two go through exactly what you need in order to get the best surround sound at home...
Craig and Jack both talk about how often they go into people's homes and see that their surround systems are placed in the room incorrectly -- a shame when you spend $400 on six speakers. The two break down exactly where each speaker should be, going as far to giving at what degrees they should be angled at and how far they should be from your TV.