The website "Linkpendium" is a must stop for researchers. It doesn't provide any data on its own, but it links to a multitude of sources you may be interested in. It is continually updated so new sites are added as time goes on.
Navigation is easy on the site. From the home page you are provided a list of localities and surnames that link to more complete information and further links. For instance, I click on "Wisconsin Genealogy" and then further chose Waushara County and was treated to cemetery listings, county history, lists of Wisconsin Civil War soldiers, links to appropriate RootsWeb mailing lists, and much more.
This is one of those sites you want to revisit periodically. You can see the site at http://www.linkpendium.com/