When somebody sends you a gift certificate, and you buy something neat that they would have bought for you anyway, what's the etiquette on that? Do you thank them, or do you lend them the thing, particularly if its the new Dave McKean comic novel, Cages, which is really as nifty as anything new I've read recently? Or do you just send them an oblique thank you on a public forum and make only passing mention of the nifty and keen PoiDogPondering CD which they also gifted to you? Ahhh, modern puzzlement. It's the best.  

So, I think the answer is to say Hey! Thanks to These Fine Folks for gifts, which I appreciated completely, and am still appreciating. You Guys Rock Harder Than You Think!