That leak might very well not be from the PS pump. It might be engine oil leaking from the cam seal behind the cam sensor. To quickly check, reach in there and run your fingers along the underside of the sensor and mounting housing. If they come out really oily, you have found the source of your leak, and it's not the PS system. You didn't mention loss of PS fluid, so oil is the more likely suspect.
Your pump is probably not the problem (yet).
Perform a complete and thorough fluid flush, put some of Paul's magic snake oil in there, and run it for a few weeks. You might get lucky and the seals will expand enough to seal and the snake oil will clean it out. If not, it is probably time for a new rack and a complete backflush. Did I mention, FLUSH BEFORE adding the snake oil, not just dumping it in without getting the old, contaminated fluid out first?
Your rack is exhibiting classic signs of "morning sickness" (Google search term: "steering rack morning sickness"). Chemicals may prolong its life, but replacement of the rack itself is the only long term solution. If you fail to properly clean out the system after rack replacement, the replacement rack will quickly start exhibiting bad behavior.
Steve
<small>[ February 24, 2003, 08:58 AM: Message edited by: projectSHO89 ]</small>