My Erdős number is 2 (which is, of course, the lowest it will ever be).
Three of my co-authors have Erdős numbers of 1. Listed in the order in which they became my co-authors:
My first collaboration was with Andrey Feuerverger, which gave me my first finite Erdős number of 4.
Many thanks to Jerry Grossman et al. for maintaining the Erdős Number Project home page.