I agree with mommyS.
Kids are still a little rough with the books, so I'd suggest some board books. Always good: Sandra Boynton (red hat blue hat, barnyard dance), Goodnight Moon, ABC books.
At 18 months, my son received "Apple Grove Pals" set of toys and absolutely loved them. Their hats come off. He now has probably 15 of them (he's 26 months), they call come with an accompanying book. Our favorites are the Heros set, the Pancake Caper set, and the Goat tractor set. All the others are good, but not the best as far as the books go. http://www.littletikes.com/toys/apple-grove-pals-friends-...
I'm sure your new son will have a preference as far as the type of sippy cup goes. He may prefer a straw type. He may be great with a cup already. It'd be best to find out what brand/style he uses right now and get the same kind. If not, my son uses the Take N Toss brand. They have Toy STory ones right now and he loves them. He also LOVES his www.tummytickler.com juice. Just click on the link to see the types of tops you can get on your juice. I got two at the grocery store and they're leak-proof and they go in the top rack of the dishwasher. My son likes his Train and Buzz. He lost his Corduroy one.
Forks/Spoons/Plates -- At this age, it may be easier for him to hold a thicker handled fork. I think I bought Gerber for my son. Nice thick rubbery handle. My son loves his Buzz light-year plate. Of course, he only has one and we use it occasionally. It's not microwave safe. :(
Toys -- wooden block letters. All boys need to build with blocks! If you can find out what characters he likes or a show he loves, get him a new soft cuddly stuffed animal. My son liked Pooh-bear at 18 months. PUZZLES. Any puzzle is a great learning tool and lots of fun. My son likes them all. The one that makes animal noises is his favorite lately.
Bibs -- my son stopped just recently wearing a bib. He only wears one now if he's eating spaghettios or soup or something really messy. So if you get one or two, get the ones that you can wash in the sink that have a pocket on them.
Cracker holder -- I don't own this brand. I bought one that felt softer (at Babies R Us). But these snack 'catchers' are awesome. http://www.munchkin.com/products/detail.html?pID=905
Goldfish crackers -- don't all kids eat these? Perhaps it will be a nice 'comfort food' in his new place with you.
It'll still be hot in Texas in two months, so maybe some sun glasses, outdoor toys, balls, swimsuit, sunscreen, hat, etc. For the winter, register for a coat and a hat. Mittens -- he may or may not wear. My son didn't like them too much.
Congratulations. That's all I can think of right now. Don't forget to get a digital camera! You'll be taking lots of pictures. :)