Ravel Law is the newest legal research kid in town started by two Stanford Law grads, Daniel Lewis and Nik Reed. They are focused on making legal research radically easier, faster, and more intuitive.
“Our goal is to be the first stop for case research, giving users tools to quickly identify the most relevant and important cases, understand how they should be interpreted, and collaborate with peers. We’re building a clean, collaborative interface that uses sophisticated analytics and advanced visualization to show how legal data (primarily cases) rank, connect, cluster, and evolve over time.”
Law school students and faculty get free access: http://www.ravellaw.com/
(Note: Website optimized for Chrome and Safari)
They should allow some small firms access to get a flavor for usage in actual live case focused work