os X server memory leaks?

Hi, I'm running OS X server (l10.4.8), all firmware updates current, on a Mac Pro with 2 GB RAM. After a restart, Activity Monitor reports about 180 MB or less of wired memory. However, in a matter of a few days, or even in a few hours, this climbs up to almost 1 GB. The culprit seem to be "kernel_task". Not sure how performance is being affected but this obviously should not be occurring. Services running are AFP, DHCP, DNS, Mail, Open Directory and VPN. This is a small office with only two client machines connected, a macbook pro and an intel imac. I'm having Cocktail run all of its scripts daily without any affect. Logging out also does nothing. Any ideas on why this is happening and how to prevent this would sure be appreciated!

This post mirrors one I started earlier in the mail services section at http://discussions.apple.com/thread.jspa?threadID=699369. I believe that it's more appropriate for this discussion to be in this category though.