Game Scripting Mastery is a a book squarely aimed at helping design and create your own scripting language for games - you can even extend to creating an interpreter (like the original DB) so you can have your very own programming language!
I found this book really usefull, as some of you might know from the (4) interpreters I've developed and released. I'm selling it to help pay for some driving lessons.
The book is in almost perfect condition, and it comes with the included CD.
If you're interested in buying checkout:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ih=019&item=290028357666&rd=1&sspagename=STRK%3AMESE%3AIT&rd=1
(If you have any more questions about the item post here, or contact me through eBay!)
~Heed my word hobags: Jism~