Here is an interesting article about a possible tax exempt status legislation for non-affiliated teams in the state of Ohio:
It is interesting to note that they are proposing this to attract independent baseball to the region. If so, the state of Ohio (and the region) must see the benefit of independent baseball from a tax revenue and credibility standpoint.
If you have other information on tax exemptions specific to independent baseball then please leave a comment here with a link(s) to relevant sites citing your claim. Again, anything which adds legitimacy to the independent baseball industry is welcome on this site, especially when it comes in the form of endorsements from state agencies and major sponsors.
There are several good books about the independent professional baseball leagues. You are welcome to see a list of suggestions through this link: Books Get notified of upcoming independent baseball tryouts from either of these services: first service or the second service. Prospective players can find some helpful resources here We will be providing a growing list of possibly helpful tips and suggestions on various baseball information. This will range from "how to" information about baseball skills all the way to helpful information for casual baseball fans. Please click the link for more information: Tips And How To Information