For anyone who thought they'd missed their opportunity to play DBO, and for everyone who enjoyed the game and wants to give it another go, here's some fan-run private server projects you should definitely check out:
InchaosDB
"InchaosDB is a project to make an online dragon ball available to everyone, open source source code and also the compiled files, ready with tutorials for the less expert people. They currently have two versions in which they are working and update periodically through their own launcher. They are also looking for people who can help them in the development of the project."