Liam can now sign about 45 words and say about 24 (depending on what you count as a word and assuming I'm remembering everything). His signs are focused on animals, objects and requests, while his words are more focused on people (although animals and statements are close behind). Of all his words, there are only 7 that he can't also sign and they're almost all names, colors and letters, which are a bit more abstract. His words basically consist of the vowel sounds plus B, D, H, M and N.

I'm very glad we tried sign language with Liam since it has clearly enabled him to communicate with us much more than he can with words alone. I'd imagine this leaves him less frustrated than he would have been, but who knows? His vocabulary is very strongly centered around nouns (the verbs he knows like eat and sit are more focused on the nouns involved - like the food or the end-state of sitting - than the actions themselves). Grouping people with animals makes the focus on living things quite clear too. He's also picked up on the names of things before the attributes (e.g. ball before yellow). His spoken vocabulary is limited by the sounds he's capable of making, and his signs are also limited by the dexterity of his hands (yellow, sheep and water all involve more difficult hand shapes).
Here are the lists of words I'm counting so you can judge for yourself whether they "count" as words :) Drum-roll please....
Signs:
Animals (13) : cat, dog, fish, lion, bird, pig, monkey, horse, cow, owl, bear, turtle, giraffe
Objects (11): moon, book, light, phone, bath (tub), fan (ceiling), ball, "that" (pointing), shoes, car, plane
Requests (10): help, open, pick-me-up, more, eat, drink, milk, please, down, sit
People (1): daddy, mommy
Statements (6): no (head shake), yes (head nod), all-done, bye, blow a kiss, hi/bye (wave)
Numbers (1): one
Colors (1): orange
Food (2): apple, banana
Says:
People (~6): Dada, Mama, Ady (friend Adeline), Baby (himself in a picture, or other babies), Debbie, Mommy, Daddy, Bobo (one of his grandfathers)
Animals (5): Ditty (for Kitty), 'oof (for dog), Moo (for cow), Raaar (lion roar), Baa (for sheep)
Statements (4): Bye, No, Hi, Uh-oh
Objects (3): Ba'a (Ball), Bone (dog's bone), 'Aoom (for car's vroom), Boo'oo (Pool)
Requests (2): Mo'h (More), num-num (for food)
Colors (2): B'oo (Blue), Yeddow (Yellow)
Sounds (1): A-choo (to fake a sneeze)
Letters (1): B