Since 2000, Bike Rides in Indiana lists touring bicycle rides in Indiana and nearby locations in Kentucky, Illinois, Iowa, Michigan and Ohio as well as several larger regional rides.
The webmaster, Michael Heyes, lives in Fort Wayne, Indiana and has been cycling for the past 1,000 years. Or so it seems. The site is a public service dedicated to all current or aspiring cyclists. I hope it continues to be useful. If you know of any touring rides not listed please let me know.