Have a kindergarten or early education question?

I have heard that children start reading by 3-4years and can as these are their critical years.

My son is 3 1/2 years old, and I am finding that those who fall in the middle socio-economic range are hard pressed to find preschool programs with availabilit. I am seriously considering an at-home preschool curriculum to get ready for Kindergarten. Is the KinderIQ curriculum too advanced for a young preschooler?

Where can I find good free kindergarten worksheets for my 5 year old? Also looking for computerized worksheets?