Making sense of Page File and RAM usage

I'm starting to get used to my new workstation;

Asus P5W DH Delux
2Core Duo 2.66
4Gb RAM 666MHz
2x 10k 73Gb Raptors in RAID1
1x 350Gb Seagate
Quadro FX1500
Win XP Pro x64
SW07 SP2.0 Office Pro x64

I notice that my Page File usage is at 1.2GB yet available physicalmemory is at 2.6GB

Running a few minor apps as well as SW. Why isn't the physical RAMused before the Page File? Do I need to tweak something?SolidworksAdministration