On of my favorite sites for finding sources of primary law on the Internet is American Law Sources On-Line (ALSO!). In addition to providing a very comprehensive list of links to freely accessible sources of law for the US, the states, Canada and Mexico, ALSO! also has links to law reviews, briefs, and more on the Web.
Check out the list of Wisconsin sources. Through a series of nicely organized pull down menus, you can select the sources you need and choose whether to search or browse them. Rather than going to multiple sites for each source, ALSO! has compiled all of the sources you need on one page. Quite nice!