We recently did some performance optimisation work for SUSI. It was a fascinating problem which had apparently stumped several companies over the years. Well we got very into it and eventually found a bug in the .Net drivers for MySQL.
We patched the bug and massively improved the stability and performance of the system. We submitted the fix back to MySQL to help the project.
SUSI were delighted with the results, and apparently Oracle were too because they sent us this t-shirt to say thanks! Thanks Larry!