In a move with possible profound implications, Google Scholar has added a dedicated search for legal journals and court opinions. Check it out here. Apparently they have the entire Heinonline database included as I located a couple of articles I wrote back in 2005 that I didn't know were available on the free web. My first guess is that this will not convince many lawyers to move from their current legal research tools, especially since so many now enjoy free legal research via their bar associations. But for those who pay for a limited plan, there may be a way to find cases outside of the plan for free. Many may now find that they have access to legal journals previously not available.
In a related note, the ABA Legal Technology Resource Center has just released a free full-text online law review/law journal search engine that searches the free full-text of over 300 online law reviews and law journals as well as other document repositories.