Its like somebody read my mind... a few days back i was whining about not being able to search Google.co.uk... i like search Pages with UK and about not being able to add other Search providers... I just noticed on IE blog they have given a registry script by which you can add custom search options.
They have shown using msdn search as a part of IE... that is top thinking...
i am going to add that and Google UK search.
Here is post from IE Team
And here is my version of script based on their post.