We are no longer participating in talent search, though for a variety of reasons. Dd13 is in high school now and, although you can participate in 9th, I'm not sure that those scores wouldn't show up on a more "permanent" record once you're in high school.
If a student does better on the SAT in 11th grade than in 9th, I doubt the presence of the 9th grade SAT score will harm the student's chance of admission at a selective school -- but this is speculation.
ETA: Princeton Review
http://www.princetonreview.com/sat-score-choice.aspx says this:
[M]ost colleges want to see all of your scores. And most colleges already consider only your highest scores (by section or by test date) when making admissions decisions.
Let's say you take the SAT Reasoning Test in June and earn a 610 Math, 520 Critical Reading and 580 Writing, for a cumulative score of 1710. Then you take it again in October and earn a 590 Math, 640 Critical Reading and 620 Writing, for a much better cumulative score of 1850.
You might be tempted to use score choice and withhold your June scores. But that would be a mistake. Sending scores from both test dates will help you with schools that consider your highest score from each section (since you earned a higher Math score in June), and it won't hurt you with schools that consider only your highest set of scores. So the mix–and–match schools would give you credit for a cumulative score of 1870, and the highest test date schools would put you down for an 1850.
If you bomb one of the SAT Subject Tests, it may make sense to withhold the score. Just make sure that this does not violate the policy of any of your prospective schools.
