The Now Habit, the book that was suggested with that "Procrastination is not Laziness" post last week goes very into depth about de-coupling one's self-worth and one's fear of rejection and criticism. I've started to read it, and I think that I can recommend it to anyone who's anxious about how they or how something they've made will be responded to.
Thanks for the book recommendation. I went to buy it off of Amazon and got a reminder of just how screwed up the book publishing market is screwed up. The electronic version is almost $3.00 (22%) more than the paperback.
