Yeah, I was just about to post that. Did some searching and saw that May of 07 against the Marlins Kearns had one. I have absolutely no memory of that, which, well, it was Austin Kearns. He hits an inside the park home run and you remember something like that. Must have been one of the few games I missed.
And the third inside the park homer this year was at home, the Mets game in which there was also a triple play.
How many parks in the last twenty years have had three inside the park homers in one season? I have to believe it's an extraordinary rarity in the modern era.