Found this list. It is a bit dated, but it makes interesting reading. It gives a list of Ippons in Japanese High School & College Championships over a 10 year period. The number to the right of the throw indicates the number of ippons the throw registered. Interesting reading.
What you think?http://www.bestjudo.com/article/0924/frequency-judo-techniques
NB Although there are a lot of throws in there also note there are non-throwing techniques too (e.g. pins).