This is after 2 week uptime and several programs open. iTunes, terminal, Mail, Safari, and Transmission. Plus another user logged in via Fast User Switching.

Home cooked install:

MSI K8N Neo4-F nForce4 Socket 939 ATX Motherboard
AMD Athlon 64 3400+ Single core
256MB Nvidia 7300 GT
1 Gig RAM
200 Gig IDE hard drive