This blog has been around and around on job rotations in law departments. A trio of law departments have been cited for their specific practices (See my post of Feb. 16, 2007: Philips and recruitment; April 13, 2006: rotations from specialist positions to generalists at Philips; and Dec. 28, 2006: Diageo and job swaps.).
Other posts comment on a range of points regarding job rotations (See my post of April 8, 2005: through head of administration for the department; Aug. 4, 2007: GCs who rotate out of legal for a period of time; April 27, 2007: knowledge of a foreign language helps; and Aug. 26, 2007: rotations as experiential learning.).