On a lark, I ran a Google search for the combination of “law” and “matter management system.”
In the sponsored links at the top, first came LexisNexis’ CounselLink, followed at number four by Bridgeway’s eCounsel, and number six EAG’s CaseTrack. The other top links were not for matter management software for law departments (See my post of Aug. 5, 2008: matter management systems with 35 references.).
Rerunning the search with the term “legal” found Mitratech’s TeamConnect.
Sponsors of links pay for the privilege, which is probably why several other leading matter management systems did not show up. These vendors include doeLegal, LawTrac, Serengeti, and TyMetrix.