If you try Duke Marketing:

http://www.dukevideo.com/Bikes/Books/TT.aspx

They can probably help you. There's a book you won't find there though as it's long out of print but if you can track down a book called 'Last Of The Great Road Races' by Ronnie Mutch published by Transport Bookman in 1975 - it gives a great insight into a newcomer's first impression of the TT.

Word to the wise though - the TT is a very precious thing to a lot of people and some people when doing docs etc can concentrate too much on the danger aspect. There's much, much more to it than that.