(This entry is for my own future reference; I'm not expecting anyone else to care.)

vi'o = video
raf = giraffe
ess = horse
essess = sea horse
ash = trash
mf = Bamf kitty
no = yes (pretty confusing, but there you have it)

Also, tonight he made the sign for light to ask me to turn on the table lamp (notable because although it was the first -- and just about only -- sign he learned to use, he hasn't used it in months.)

I'm sure there are others, but those are the ones I can think of right now.