I'm changing jobs too going from a real casual place to a business casual so I have started looking at ways to EDC items. I had a boss who always had to have expensive suits and expensive overprices cars carry this little leather key wallet. I searched and found one and replaced the worn Mag Lite that I was using as my keychain with the key case and started adding in items. They stay hidden because I can flip the needed key out before going in the office building. Here are a couple quick pics (They are large as I have not yet edited them) http://www.ninefamily.com/images/keycaseclosed.jpg and http://www.ninefamily.com/images/keycaseopened.jpg.
I coworker in the military gave me the P38 and it fit in that bottom hook like it was made for it. The Mag solitaire was the perfect length as well, I want to replace it with an Arc AAA though. The little knife that fits behind the keys is a Gerber Ridge Knife (same as a CKRT K.I.S.S. I'm pretty sure). I'm still working on this little PSK but with timing of this thread I thought I would go ahead and show it.