Thanks for your reply. Ok, just bookmark this thread, anyone interested, and put ur links here.
I am still thinking of best solutions to implement this, so Im open to any suggestions.
ps. Just to clarify my view on app spammers. I don't hate spam app developers. Its just that, I walk a different path from them. They are free to spam as long as Apple allows them. But, I disagree with what app spammer is doing.