I know something about $327.68 Knuth reward check. However, I cannot find a comprehensive list of people rewarded for finding errors in TeX. I do know, that among them is Bogusław Jackowski (Twice, for TeX and METAFONT. In late 70's in Poland an annual salary was about the value of the "big" check). Marek Ryćko and Piotr Strzelczyk obtained "small" checks.
Any piece of information about other people, any source (well... not Wikipedia), any additional information would be very interesting for me.
Some of SX users are winners of Knuth's checks. Their knowledge may be invaluable.