As a developer you can find all Bla-bla List information at java.net.
The wiki contains the developer documentation. It is currently being written.
The forum allows you to exchange your thoughts with other Bla-bla List users and developers.
The issue tracker contains the outstanding issues. If certain features are important to you, it's possible to vote on them to make us aware of your interest.
The download area contains released versions that have been thoroughly tested and packaged.