As you probably know, my original move to the US was not intended as a move. It became a move following advice from an immigration attorney that we had one chance to make it work out as it has; we seized that chance.
As a result of the unplanned nature of the move, I found that many things I would otherwise have brought with me are still in the UK. My parents are storing most of them, and eventually I have no doubt that I shall return to claim my own. In the meanwhile, many of my favourite books have been inaccessible to me.
However, in recent weeks, a trickle has begun. My mother sent me a copy of China Mieville's The Scar, which is greatly appreciated if only for the better cover and spellings; I had already resigned myself, and shortly beforehand, bought a US edition. In fact, I have the three China Mievilles that I love here, and so don't need any more sent over. Today, I received from my older sister a parcel containing my copies (and they are my copies; I recognise the handwriting of the price...) of Snow Crash, Cryptonomicon, and The Diamond Age. That completes to my satisfaction my collection of Neal Stephenson. At this point, the collection I miss most is my K J Parkers; particularly the Scavenger and Fencer trilogies, since I've re-bought the first two of the Engineer trilogy (in part because I prefer the US covers of these).
I'm having difficulty thinking of anything else by way of books I'm actively missing that's neither game rules nor a comic. I can, for as long as it's required, live with the film tie-in edition of Lord of the Rings, if I want to read it again, for example.