Yeah about 4 emails later (and I can see that he's logged on somewhat frequently) I'm pretty pissed that my giftee isn't getting back to me to at least let me know that he received his gift. Can't help it. It just kind of sucks.
Yeah, I found out recently that 2 people never received their gifts - in one case, I had been emailing the delinquent giver a few times about it on the recipient's behalf, since enough time had passed that the recipient was rightfully wondering what was up. In the other case, which I just found out about, that person emailed the would-be recipient again on a couple of occasions, "it's coming, it's coming" and then radio silence.
Life is hard, and sometimes shit comes up, but One should not sign up for a thing, and then leave somebody hanging with no explanation.