Too vague of a question.
Figure out what people use for equipment, first. Find your target audience.
What channel are you targeting?
Here is a relevant thread from a pro forum - http://www.remotecentral.com/cgi-bin...read.cgi?42194
This AVS forum is predominantly for end-users, and DIYers, but there are a few pros here.
I think the solution you are seeking is very specific to the chosen equipment.
For conventional multichannel amps, people choose rack mounted options.
For smaller stuff, people use regular wall-mount enclosures.
Figure out why people don't use those options, and make them easier to use. Stupid simple. They don't require advanced degrees to use, but there is some basic knowledge required. It took me years to figure them out; shouldn't be the case.
Racks and enclosures are still mostly installed by pros. Doesn't have to be this way, with more education and support provided by manufacturers. They are very good solutions, just lots of pitfalls.
More to your point, enclosures should be designed to be more attractive, surface mount, included power outlets, and with adjustable shelves.
Racks should be marketed with an eye to service - easy to swap components, plug and unplug equipment, troubleshoot. I personally prefer rack-mount equipment, but shelves are less intimidating. Power strip should be included. Small footprint, not deep, but the depth will be determined by the chosen equipment. The half-width rack idea should be pushed; most people don't have the space.