The latest update to  iTunes software enables HD rental support on the computer, among a handful of other fixes.
Renting HD movies will cost $5 and titles should generally be available for rental within 30 days of release.
iTunes 8.1.1 beside HD renting support provides a number of bug fixes, including addressing issues with VoiceOver and syncing with iPhone or iPod touch.

iTunes 8.1.1 for Mac is available via Software Update and also via standalone installers for Mac and Windows:

Download iTunes 8.1.1:
Mac
Windows

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