Yamaha just announced the YHT-S400, a two piece home theater in a box. The soundbar is par for the course, giving people pseudo surround sound from just a single enclosure you can mount below your flat panel TV. Soundbars are incredibly popular right now, as they match the design of today's televisions (which also don't intrude on the living space) and don't require stringing wires all over the place. The YHT-S400's receiver is unique, in that it has a built-in subwoofer. Oddly enough, it reminds me of the mid-1980's PC, the Coleco Adam, which combined a daisy wheel printer with the PC's power supply - two things that definitely did not ordinarily go together. The reason my mind jumps way back (and yes, I know I'm dating myself) to the Adam is because strange combination designs not only limit upgrade flexibility, it means that if there is a problem with one component, your whole system is shot. Anyone buying the YHT-S400 needs to be aware that a problem with the sub means a problem with the whole system, and that they will not be able to upgrade any part of the system in the future.
Assuming that the sound quality is good - I have not heard a unit - the price seems reasonable ($599). Yamaha is probably thinking that this design will help space-challenged apartment dwellers, but there is another market segment worth exploring: parents of small children who don't want their kids stuffing Matchbox cars into a floor-level subwoofer port. I pulled 22 cars out of one of my subs in the playroom - the subs in my home theater all have floor-facing ports. On purpose.