I made a bit of a resource guide to the Indy 500 race online:
Indy Live IndyCar Race Control presented by iRacing.com On your station starting at 12PM ET The 1961 and 1962 Indy 500 on RaceFansTV.com: First time 150mph was broken. A must watch! Live Radio Streaming Official Twitter feed of Indianapolis Motor Speedway Danica Patrick on Twitter Indianapolis Motor Speedway on Google Maps Interesting facts about the Indianapolis Motor Speedway from the U.S. Census (pdf)
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Please add more! Feel free to post this elsewhere