AngelScript IDE

try textpad from http://www.textpad.com, all you have to do is create a new document class "AngelScript" and provide your own syntax definition file which is really easy to create, just look at the syntax file for c/c++ to get an idea of how to do it (it's just a list of language keywords and operators).

Excellent thats just what i was looking for :)

Thanks
Spree

You may also want to take a look at SciTE, which in my opinion is better than TextPad, and is free. It uses a similar scheme for syntax highlighting.