Geo, I remember a set of dice I had with a three sided die.
It was a triangular tube with the rounded ends. (like the 4 sided die, the face sitting on the table/floor was the one that counted.)
fyi: it was not much bigger than the D6 cube die. just about 1x1x1.5.
I can draw you a pic if you would like.
Cheers!
P.S. I also seem to remember that my old 'Risk' game with the wooden pieces had some short triangular sticks for the armies.
One of those could easily be made into a three sided die.
Nuf said. Cheers again.
code:
. . .
.-----.-----.-----.
| | | |
|1 2|3 1|2 3|
| | | |
.-----.-----.-----.
. . .
..connect the dots to make triangular tabs on the ends.
cut out the shape, then fold along the dash'd lines.
tape the edges and voila.
______
/\ \
/__\______\ a 3 sided die. 
hmmm, why does this post look wierd? the formating seems to be off.
[ December 23, 2003, 11:17: Message edited by: David E. Gervais ]