Several times in my research I have found that my genealogy work stands me in good stead. Resources and methods I first discovered in searching for facts about my own ancestors and their lives also turn out to be good sources for information about other people’s relatives. I’ve also found that constructing a family tree for my subject can help me organize the data I have and point out connections I might not have noticed or question marks worth pursuing. (Quirky case in point: Sarah Kemble Knight, one of our Connecticut ladies, was the second wife of Richard Knight. His first wife was Remembrance Grafton – grand-daughter of Amias Thompson, who was one of my subjects in the New Hampshire book.)
A great place to start your search is the inestimable Cyndi’s List, currently boasting over a quarter million links: http://www.cyndislist.com/ . The most comprehensive of the commercial sites is http://www.ancestry.com/.
The best of the internet resources charge for access, and not without reason – scanning old documents is very labor-intensive, indexing them even more so. But lots of material is available at a minimal charge, often through local historical societies or small-town newspapers. In addition, because of the growing interest in genealogy, many public libraries subscribe to the big genealogy and newspaper sites, so you may be able to access materials from the library that you can’t get to from home.