Here's an answer for a tight entry-hall or a door that opens directly into a living area without any transition. It's a plain, magnetic knob. You simply stick your keys to it.
I love the look, but I've got a car key, two alarm remotes, two house keys, plus a computer key. How will this work for my bulky key chain?
Sleek? Yes. But better suited for those with fewer locks.
Magnetic Knob, $22 for 2. Via BLTD.