| Yes, you can partition and format your hard drive to have as many Mac OS X installs as you like, and boot between them 'till your heart's content.
Simply use Disk Utility to partition your drive into as many partitions as you like, install whatever versions of Mac OS X are supported by your machine onto the individual partitions, and use the Startup Disk preference pane of the System Preferences to boot between the individual partitions.
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