The Fisher Space Pen has to be what you are looking for. After $12 million dollars development costs for the space race in the 1960s, it should be your patriotic duty to use one of these writing implements. Simply the most reliable and heat tolerant pen out there. A great American invention. Even I've got one.
I remember reading about the contrast between the US and Soviet space programs a while back, and one of the things they mentioned was the space pen. Kinda funny, it went something like: "After millions in research on how to create something that astronauts could use and would write in zero G under widely varying pressures and temperatures, the Americans created the Space Pen, a marvel of writing technology...the Russians had the same problem to solve, their cosmonauts used a pencil."
I don't think the US space program actually developed the Space Pen, I believe the Fisher Company did that independently , going back to even before the space program, NASA just decided it was the best option.
http://www.spacepen.ca/cdn-english/index2.htm Hit the history button.
Also this old rumor is addressed and debunked on wikipedia.
http://en.wikipedia.org/wiki/Fisher_space_pen In any case I believe pencils are not a good idea in space as the graphite dust will float around in zero gravity playing merry hell inside a capsule.
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