Check out the OP's post count. They are clearly very new here and might not know how to find those threads.
How are they to know that Skype has been ported many times?
It's really not hard to be helpful. I doubt my post took any longer to type than "search is your friend". I'm not even sure what the point of such a response is except to say that "I know, but I won't share".
I'm glad I came across friendly members when I first started posting here, it made me want keep posting and also played a part in me purchasing my PlayBook.