Well... not quite, but I was involved in getting one published and wrote some of it:

http://journal.dedasys.com/2009/09/15/tcl-and-the-tk-toolkit...

It has left something of a bitter taste in my mouth though... I've made an order of magnitude more money from this article that took my a few hours to put together: http://journal.dedasys.com/2008/11/24/slicehost-vs-linode as compared to weeks of work for the Tcl one.

Also, on the subject of authorship, I would be remiss if I didn't link to my latest project, a system to make the Kindle book production process as easy as possible: http://www.liberwriter.com

I originally put it together because I wanted to write something of my own, but I'm more of a hacker than a writer, and got sidetracked growing the program and still haven't got back to the writing.