Kostis: Some of the book promo materials say Konstantinos and some say Kostis because I saw your first post (which indicates you go by a nickname) after sending the mailing. The mailing does match what is on the cover of your book though so I don't expect any complaints .
I was pleasantly surprised to find Spock mentioned in this forum even before the promotion started!
I also see that questions have started popping up...
I will write a quick FAQ post to cover the basics (so that even after the promotion ends people will find it easily)
Regarding my name the official one is Konstantinos but this is very formal. Kostis is a shorter version of the same. Imagine Elizabeth - Liz or Michael - Mike. But it is still me!
Hope that isn't a problem.