What brands of aftermarket audio systems will interface with factory steering wheel audio controls?

their are adapters available for most common cars.

http://www.crutchfield.com/S-WCt9rNTUGMn/g_118900/...

that dude that just said none said in another post he's a shop owner. I sure hope not. there are a ton of radios that can interface with your steering wheel controls. Most of them these days. You may need an adapter. I use Axxess ASWC for my customers. Some radios even have the adapter built into their radios. But as long as your radio says remote ready on the box somewhere or in the item description, you'll be able to adapt it.

none, you will loose the media interface utility