One word...polytrack. I expect him to return to form now that he's back on dirt. I'm going to couple him with both of Bill Mott's horses, Court Vision and Z Humor.
What's a bit odd to me is that Pyro's trainer, Steve Asmussen, chose to put and keep Shaun Bridgmohan on the horse rather than the far more capable Robby Albarado who rode Curlin, last year's Horse of the Year, for him.
Once again, here are the links I gave at the beginning. There's an enormous amount of useful info here for anyone interested in betting the race.
From KentuckyDerby.com, in depth info on every horse in the 20-horse field (inc free video and charts of prior races):
http://www.kentuckyderby.com/2008/contenders
*FREE* Equibase Past Performances on pdf file (they give free ones out on occasion for major stake races):
http://ntra.equibase.com/eqbNTRAGetFreeFF.cfm?trk=CD&rd=05/03/2008&cty=USA&de=D&rn=10
ESPN's special page for horse racing (source for the free Equibase past performances pdf):
http://sports.espn.go.com/sports/horse/index
National Thoroughbred Racing Association (main page):
http://www.ntra.com/