The fourth official release of Madabar Vocab (v0.5) is available on the Download page.
This is just a minor bugfix release. It fixes up the Find dialog. It also fixes some problems with Python 2.2 and Qt 3.1, so it should work on Red Hat Linux 9 now.
I discovered a GPL packaged version of PyQt the other day. This means that you can use Madabar Vocab under Windows now! Just follow the instructions on the Download page.