My son will test take Kaufman Brief intelligence test (KBIT) Vocabulary Subtest and Naglieri Non_verbal abilities test (NNAT) soon. Can anyone recommend great test prep resources?

I believe that this type of question in the past has been answered by directing the person to Hoagie's where they have an article on test prep: http://www.hoagiesgifted.org/test_prep.htm

Generally, I'd venture to guess that most of us would suggest not prepping a child for ability tests b/c the goal is to get at what the child can do without practice. Of course, you don't want an anxious child, so going the route of what the Hoagie's article mentions in terms of trying to prepare the child for the experience of taking a test is probably a reasonable idea. Practicing questions of the sort on the test isn't generally recommended, though.

I remember when I was a child that the entire IQ testing experience was just very odd for me.

My parents wouldn't tell me where I was going or exactly what was happining. I remember being annoyed by this and I wasn't exactly cooperative during the early part of the testing.

I agree, going over how to test, helping them understand the type of test etc through that link and just through talking to the child is all that is necessary... actually preping for it really defeats the purpose...the goal is to see what they can do raw data wise.