We have released an update for the add-on, which fixes some problems you have reported. We have also received lots of requests for new features, some of which we are hoping to implement in the coming months. Thanks for the feedback!
Here are the notable changes compared to WOT 20070329:
Bug fix: fixes memory leaks when closing windows.
Bug fix: adds more robust error handling and fixes a handful of other minor problems.
Version 20070501 is now available for download from our website.
(Visit Mozilla Add-ons for previous versions and a more detailed version history of the WOT add-on.)