I know that it's a risky thing to run a MySQL version from the development source tree. But a lot of work has been done since MySQL 5.1.7 and I have experienced that the latest development version runs better than the most recent released version 5.1.7, so I dared to update MySQL 5.1 to 5.1.10-beta.
Maybe it's a little consolation for those who cannot participate at MySQL Users Conference, so you can in the meantime try all the new features at the very latest state of development. But be aware that there can be bugs that can usually not be found in a release version.
So take good care of db4free.net while I am trying to collect new experiences at the Conference, that I will certainly be able to use to make db4free.net even better :-).