Hi, just wanted to say I really enjoyed reading about your talented son. In the Australian education system, they use 'talented' or 'academically advanced' and reserve 'gifted' for if the child is super advanced in a single area, like music or mathematics - 'a gifted musician' Its just politics though!
I have a 16 month old girl who is quite bright too, but not as advanced as your son, or some of the others who commented. She is quite balanced, with fine and gross motor skills, can say well over 200 words, uses 4 word sentences, taught herself to count to four, identify and say most colours and shapes and understands and identifies tons of opposites and other concepts.
Mostly we just have fun with her though, playing and being loving and silly, the learning is just incidental, stemming from our natural conversation with her, play and reading.
I don't think too much of it though, I just think we've spent a lot of time with her (first child and all). I think most kids would be the same way if they had all that attention.
But your child sounds incredible! You must be doing a great job, and be blessed with great genes. Don't feel ashamed, its natural to be proud, after all I'm sure you have and are contributing heaps to his development.
Its amazing how much people writhe at the mention of the word gifted though isn't it! People with very average children get all defensive, as if it means somehow that their child has no redeeming qualities whatsoever! It might be best to ditch the word in favour of 'advanced' to avoid this negative reaction.
Join a toy library, play music and games, take him to kindergym or gymboree for social and physical skills and keep reading! Don't tell him he's advanced though, or he might think of himself differently, just keep stimulating him and providing learning oppurtunities if that is what he obviously loves.
Congrats and best wishes finding resources in your local area to help extend him through preschool and school.