There's an upcoming knowledge management conference. In the list of exhibitors which included Convera, Inktomi, Intelliseek, TheBrain, Vivisimo was ClearForest. Their products seem directed specifically at the financial market (mergers, acquisitions, executives, stocks, etc):
However, it seems suited to general tasks as they won the KDD Cup which is over fruit fly material. The ClearCharts (once you get past the speil) and ClearResearch have fairly neat UIs. The ClearTags demo doesn't work. Their downloads include more marketing material.