I believe there are probably a dozen other products out there that are much closer to what the Central is/was. But it's painfully obvious the segment hasn't caught on and is far from mainstream.

Edit:

Imerge SoundServer: http://www.imerge.co.uk/products/improductshtml/ipmain.html
Ecient Fireball E2: http://www.escient.com (these guys are owned by D&M)

Bruno