As part of Ubuntu Open Week, there are also a couple of Launchpad sessions, including one on Launchpad Translations by Carlos and myself today.
To learn how you can benefit from Launchpad Translations if you are maintainer, developer or translator, join in #ubuntu-classroom on FreeNode today (April 26th) at 18:00 UTC (20:00h for me :).
PS. There is one question I probably won't be answering, and that's why Launchpad is not free software: I don't know more than FAQ can tell you, and I hope it will become free software in the (again, I hope near) future, or I wouldn't be recommending it for your free software development either.