Over at mysql.bkbits.net you can also get the “telco” (commonly known as CGE or “Carrier Grade Edition”) source trees of MySQL Cluster.
I think it’s exciting that we now have the source trees up here. You can use the freely available bk client to pull the sources or the commercial bitkeeper.
Since I just got back from the US for the MySQL UC (which was rather awesome) I don’t quite have the energy to go into the difference between normal mysql 5.1 and the telco trees… so wait for part 2 :)