I really love my Leatherman Micra. It has sat at my right hand on my desktop for years now, but I've never attached it to my keychain. While undeniably useful, it's just a bit too bulky to hang there between the Zed Drei's alarm fob and the knockoff Photon light.
At Fry's the other day, however, I ran into a package deal containing the Leatherman Style and a Lenser V9 and snapped it up. That's exactly the setup I was looking for to put some useful tools and a bright and tough mini light in there amongst my car and house keys. Recommend!