I used to skate, about five years ago, for about five years. The acid drop is a borderline 'trick', but the caveman is the most stupid thing I've ever seen. At the very least don't waste your time with cavemen.

I used <a href="http://www.bobstricktips.com">Bob's trick tips</a> to learn heaps of oldschool stuff. They have picure series there now, but it used to be better when they didn't get charged $9 million for bandwidth, because there were these kickin' rad videos of all of the tricks.