Disclaimer: I don't claim to be an expert. The stuff in this email could be false. If you use it, use it at your own risk. Also, since about 7/05, I've earnestly tried to keep my large-scale internet presence politically/religiously neutral. Stepping on big toes with such new and powerful technology seems highly incautious in my case.
I was tested by a professional when I was about 6 or 7 years old.
However, I think that IQ can change, so I really don't have a good answer for the thread title. If my I.Q. is as high as it supposedly was then, I simply say: Good enough that I don't currently intend to spend 10 hours per week trying to raise it by 10 points this year.
Why do I think that I.Q. can be raised when so many "experts" seem to assert otherwise?
http://www.winwenger.com/
http://www.winwenger.com/edtech.htm
http://www.winwenger.com/mind.htm
"T & L Techniques: Great teaching and learning methods to increase IQ and creativity." (bolding mine)
I practiced some of these forms of meditation for a little while. Subjectively, they seemed to increase some of my perceptive abilities for a while.
You might want to be careful around some of these techniques, though. Image streaming in groups may be effective; but, it reminds me a bit too much of something that may be similar to mass-hypnosis. Just exercise caution, as I'm sure you do. :)