Lots of hits via Google looking for information about re-installing MySQL under 10.2. Here is my posting, which adds a little bit to Marc Liniage’s MySQL update and installation instructions.

side note: Today I noticed that 10.2 seems to install a mysql system user by default, which explains why my MySQL user login is no longer showing in the startup list. Even if you don’t have MySQL installed, you can confirm this by checking available users in the Ownership & Permissions section of the Get Info window. Maybe this means future versions of OS X will pre-install MySQL by default. That would make a lot of people happy.