The 10,000 (or 10K or 10^4) commit to our code/data repository happened over lunch.
Was slightly disappointed by the lack of balloons. But it proves, once and for all, who the best coder is. It was even a legitimate commit, not just to grab the top spot ;)
We keep all our changes in a big repository (SVN) so we can see each other's changes and blame them when things go wrong. Ten thousand sets of changes have been added since it started at the end of July 06.