*Minimum System Requirements for VMware Fusion 3 (through VMware Fusion 3.1 update)*
Any Intel® Mac.
Minimum 1GB of RAM (2GB RAM recommended)
700MB free disk space for VMware Fusion and at least 5GB for each virtual machine
Mac OS X 10.5.8 or later; Mac OS X 10.6 or later (Mac OS X 10.6.3 recommended for best graphics experience)
Operating system installation media (disk or disk image) for virtual machines
Note: Microsoft Windows Not Included
Recommended graphics hardware for Windows Aero support:
To experience Windows Aero 3D graphics, you will need the following graphics hardware:
ATI Radeon 2600 or better
NVIDIA GeForce 8600M or better
See list of VMware Fusion 3 Supported Operating Systems
See list of VMware Fusion 3 Features