Willie Perreault is really awesome.
He used to be Olympiad captain ('08 and '09 nats). He has competed in SciOly and Sci Bowl as well as leading WSSL and doing TARC (although that's dead now). He was also pretty much the unofficial Vice President in '09.
You can ask him for advice about anything you want ad he will attempt to answer, but he is most knowledgeable about Olympiad specifically: Envirochem, Forensics, Chem Lab, Fossils, Time, and to a slightly lesser extent buildaheads.
He's also a prety good guy to talk to about various stf-organization procedures.
Also, he likes the concept of pancakes.