It's OK, very simple to use , which is how I like my programs.
I like the fact it does not take control.
If I want a diagram with just two Rooks - then I am allowed a diagram
with just two Rooks.
All of these other diagram making things tell you - 8 pawns only,
position must have 2 Kings etc etc and error checks you.
They take control
So if I want I can make a Cross with White Kings.
I can make a cross with white kings.
http://chessimg.com/W.png
improvements
Give user option to save as a fen.
I have copied this fen from url banner on your site but it would be
good if I could 'click' and save it.
Invalid FEN inserted - 3KK3/3KK3/3KK3/KKKKKKKK/KKKKKKKK/3KK3/3KK3/3KK3/&h=3hh3/3hh3/3hh3/hhhhhhhh/hhhhhhhh/3hh3/3hh3/3hh3
Different design of pieces would be good - give us comic ones
as well as the usual sets - Dr Who - Simpsons, Looney Tunes
AND NO ARTY FARTY MODERN SETS.
PS: it says on your profile you are a 'world record holder' what as?
EDIT1: Just tried the embedding option and it works on Chandler Cornered.
I'll use it - can you make highlighted square a bit more distinct.