I also received the Reader's Companion Guide. I had wanted to wait for the 2-volume boxed set, but that doesn't appear to be out yet, at least in the US. I've been waiting two years and couldn't resist so put a bug in my husband's ear. I wonder whether I'll have the patience to actually plough through the thing or just use it for reference.
Other additions....My son got me an older Ballentine edition of Smith of Wooten Major to add to my collection, plus the Tudor Mint statue of Frodo and Galadriel came from a friend.
At least people don't have any problem buying for me, since they know exactly what I like.