Wikipedia seems to have got its act together over moderation and you rarely come across lies and vandalism any more, which is where this search engine comes in.
Simply type in the name of the Wikipedia page, and it will flag up any content which has recently been removed from the site, either through vandalism or being badly written rubbish. (Though sadly not all deletions are vandalism, which is why you get quite a few boring entries too)
NB Pages must be spelt as they are on Wikipedia, ie names must be capitalised.
Please flag up any funny vandalism for inclusion on the blog.