Joyent wants a signed license agreement to say "N_de.JS" anywhere unless they decide your use of the trademark is "nominative" which is subject to their interpretation. They are giving out free licenses now but assuming revenue for the N_de.JS market increases to be more significant, one has to assume that there will be more and more pressure to extract a greater share of the revenues by using these license agreements to either stifle competition or to pull in fees. Especially since one of their main businesses seems to be directly competing with many of those services. So I'm not in a rush to sign a license with them and therefore just avoid using the term for now. It does look silly though so I may have to rethink that and consider this free (for now?) license thing.

Also thanks a lot for checking it out and the feedback. I made the CoffeeScript logo link to your book page.