I have not worked with the Translate Toolkit yet, but I'm a little familiar with a few of the tools. I'm always interested in learning or contributing where I can.
I currently work on a proprietary l10n/i18n system, so a lot of what I do is under an NDA. However, I'm slowly gaining traction in moving us, at least in part, to a more open model.
If you're not and are interested by it or in contributing to it, you should email me - I'll put you in touch.