Most law libraries provide online access to their research guides. Although they may contain information specific to the library's collections, these guides provide references to treatises, Web sources, major case law, legislation, and other relevant sources that can aid in one's research.
If your research is state-specific, you may want to browse the Web sites of a handful of major law libraries in that state.
Another option is to use Cornell's Legal Research Engine which searches only the top legal research Web sites and where you may limit your search to find legal research guides only.
The following are just three examples of law library research guides.