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VMware released a free player that allows you to run virtual machines created by VMware Workstation, GSX, and ESX Server as well as Microsoft virtual machines and Symantec LiveState Recovery disk formats. You can download the free VMware Player and a pre-built Browser Appliance loaded with Ubuntu and Firefox. Steven Warren walks you through the VMware Player installation and use with these screenshots. You can read more about Steven's experience with VMware Player in his The Hot Button blog.
According to the VMware Player Manual, you'll need at least 1GB free disk space for each guest operating system. VMware Player only requires about 150MB.