If your department maintains a legal intranet, you might wish to track some of the same traffic metrics that bloggers do. You could monitor the number of visitors, visit length, pages viewed, and business unit represented. You could find out which people visit with what frequency. You could also compile metrics on the amount of content on the intranet. A further analysis could study which items are used (viewed, downloaded or annotated) the most.
These would not be metrics collected for metrics sake, but to help you decide what parts of the intranet offer the most value. Fertilize those areas and prune or replant the others (See my post of Nov. 30, 2008: legal department intranet sites with 12 references.).