I posted about this in two other forums days before our Happy Hour. Also, I sent out an email to all of my affiliates about this (and several other) promotions that we have running right now. If you'd like to stay up to date on Dotster's many promos, becoming a Dotster affiliate is probably the easiest way.
Sorry we missed you. This won't be the last happy hour, I promise. We have another sweet promotion running until Thursday where you can get 5 free domains with the purchase of any hosting package. That's such a good deal I even took advantage of it myself!