In an article in the July issue of the Illinois Bar Journal, "Finding Free Legal Articles on the Web" (ISBA membership required), Tom Gaylord suggests these sources for finding free online law-review articles--
- Google Scholar;
- SSRN -- Legal Scholarship Network;
- Washington & Lee's Current Law Journal Content;
- Individual titles, found on sites like Law Review Home Pages at the University of Chicago Law Library.
You'll find tips and caveats about these sources in Gaylord's article, which is recommended for reading.