I think the solution has been on Wikipedia for some time - it's presumably why the article is semi-protected from edits, and there's a lot of fierce talk on both sides on the discussion page.
What is somewhat interesting is that after 60 years, the performance rights of 'Mousetrap' have only just been made available in Australia. Sydney's
will produce the Australian premiere of the play in 2011. The rights holders really have been very strict about keeping the secret for many years, so it's hardly surprising they're upset at finding out it's on Wikipedia.
But I guess Australians will no longer have to travel to London or Wikipedia to find out the ending...