since the original files of the newton logo weren't available anymore and we only had the gif file at the top of the forum, i recreated the logo with resolution independent vector graphics.
unfortunately i didn't have the original black font but i think arial black is okay too.
in case you would like to show the logo in your game you can download it from here:
http://newtondynamics.com/users/Thomas/newtonlogo.exe
~ 0.3mb (self-extracting zip file with the logo in eps, psd and png format)
(the newton license doesn't require you to show the logo. you just have to give proper credits.)