Pen Cap Handcuff Key a few weeks ago. We were able to get our hands on a prototype version of it and its pretty slick to say the least.
Its a hidden-in-plain-sight Escape and Evasion tool, that will definitely go unnoticed. Unless you know what your looking for.
I like the concept. A pen is a very non-threatening item that would most likely be over looked in an initial search. If worse came to worse; you could cut the handcuff key clip section and hide it on your person.
The Pen Cap Handcuff Key retails for $9.00 and are available at Shomer-Tec.