One of the easiest ways to learn about your state's homeschooling laws is to visit the website for your statewide homeschool support group. Statewide homeschool groups are not only the first to alert members about proposed laws, but they also work to actively inform legislators about homeschool issues and to rally opposition against bad legislation.
Another way to inform yourself about your state's laws, or to learn about regulations in other states is to visit HSLDA, the Home School Legal Defense Association, where current laws and proposed legislation for each state are analyzed in detail. It may be a good idea to join both your statewide group and HSLDA to stay up-to-date on proposed changes to existing laws and to give yourself some protection, especially if you live in a more highly regulated state.
For your convenience, you can also click the the name of your state below to go directly to its legal page from HSLDA. They are grouped according to the level of regulation you can expect to face, with those under the green heading being least restrictive, and those under the red heading the most regulated.