The American Homeschool Association (AHA), is a service organization sponsored in part by the publishers of Home Education Magazine. The AHA was created in 1995 to network homeschoolers on a national level. Current AHA services include an online news and discussion list which provides news, information, and resources for homeschoolers, media contacts, and education officials.
Although it seems that the majority of the responsibility of homeschooling falls to mothers, there are many fathers who participate in their family's homeschooling to varying degrees. From dads who help teach science or take the kids on field trips to fathers who do all the teaching while his wife is the breadwinner, fathers have many roles to choose from when a family is homeschooling.
Although this article has some outdated date information in it, it is a good discussion of the use of the PSAT/NMSQT (Preliminary Scholastic Aptitude Test and National Merit Scholarship Qualifying Test) for homeschoolers, especially those who are interested in qualifying for certain scholarships.