I suspect the question was asked because of Masood's post about contributions for MySQL.
Looking at yesterday's commits I see that we took in contributions from four people. There were 26 patches in total from those four people, and of those we had to correct two of the patches. One of those people comes from a team of three at one company who are working fulltime on Drizzle at the moment in order to get their code released.
Only one actual paid for by Sun employee committed anything yesterday :)
Which reminds me that I need to get back to hacking, the global locks around @variables are not going to fix themselves :)
More fun numbers:
47 contributors according to Launchpad.
In total sense the project became public last year?
Somewhere around a hundred people.
We have five active Drizzle developers in Sun right now (Lee has been too busy as of late with other stuff, hopefully we can change that!).
None of this includes work on the new drivers.