I love these threads. Grin.

I have tried carrying keychain lights on my keychain. It simply doesn't work that well for me because (1) my keychain is too big these days, (2) the keychain lives in my coat pocket, and (3) the light will get banged around quite heavily.

So I compromised. My CMG Infinity Ultra lives in my front pocket under my wallter. My PrincetonTec Blast also lives in my front pocket, but it rests upright alongside my wallet. My Arc AAA stays inside my right back pocket, clipped to the pocket's lip.