Found a similar list. I don't think it's the one I saw before, but it is very similar. I will copy some of the relevant sections, but will also PM the link to you as well. I honestly don't think Sam's on the spectrum, but it's something I've been paranoid about because of his speech delay.

THE second YEAR - possible signs of Autism & Asperger's syndrome

• A lack of interest in other children and people

• Lack of eye contact

• Not pointing at objects that are wanted

• Not using sentences of two words by two years of age

• Losing words or language skills that were already acquired

• Repetitive behaviors such as hand flapping or rocking

• Does not look at objects you are pointing to

• Does not play pretend games

• Walking on tip toes.
TWO TO FIVE YEARS - possible signs of Autism & Asperger's syndrome

• A lack of interest in other children and people

• Lack of eye contact

• Not pointing at objects that are wanted

• Lack of, or strange reaction to the distress of other children

• Obsessed with certain objects, toys and games

• Focus on order, routine and arrangement of objects

• Distress when these orders, routines or arrangements are disturbed

• Repetitive movements such as rocking, hand flapping, or spinning around

• Sensitivity to loud sounds that don't disturb other children

• Sensitivity to touch ie. disliking hugs or fabrics of certain clothes

• Sensitivity to smell and taste.
Even if your son is showing some of these signs, it doesn't necessarily mean he is on the spectrum. Having seen kids in high schools... I honestly believe that the earlier you find out and get them help, the better.