I've had problems with VMWare, so I have decided to give VirtualBox a go. Points to note;
Virtualbox rpms in Fedora (13) repo don't work. Download direct from VirtualBox. You create the machine first, and then when you start it for the first time you will be asked to point it to an .iso to install the OS. Have any product keys ready. To use shared folders you need to install Guest Additions. It's already bundled, just not installed. Follow tutorial here. Wireless. You have to enable it when your VM is shut off. Follow these steps.