Bonddb is licenced under the LGPL licence.
A lot of new and exciting features are planned for bonddb in the future. At the moment development is pretty heavy but some items on the todo list may not be started till after version 1.0.
If anyone is keen to do some work on bonddb there is a TODO list. The cvs server is behind a firewall but I can give accounts to get access to it if anyone wants it. The code can seem daunting at first due to the complexity but once you grab the overall picture of the system its quite easy to break it down.
Some major tasks like bindings to languages has yet to be done, and is low on my priority list. Binding directly into a language would be highly useful, just not as useful to me as it is to others.
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