[Mat - please nix this up front if there is no chance, otherwise we will make an initial evaluation.]
Yahya brought up the subject of Testopia last week at the team meeting but I have not had the chance to take a look at it until this evening. I for one misunderstood what is used for. It is not a testing tool, but a test tracking system from Mozilla. From the website:
It looks as if it may be a useful addition to our testing toolkit, but the problem is that it requires patching Bugzilla. Achim/B. if you want to take a very quick look at it and if you come up with a positive verdict, I can ask the EF Web Masters to consider making it available. As that is a long shot, I would not spend a lot of time up front.