Open Groupware - wow!
After studying their docs I'm very impressed by the software - it seems like it would cover most non-code project management needs and could nicely complement my usual set of tools.
OpenGroupware also provides an XML-RPC interface (so they say - I haven't tested anything), which could be very useful in integrating such a tool with custom workflow or editing tools.
Thanks Sylvain! I'll keep this in mind.