Microsoft SharedView
Still in beta (beta 2), but I'm very interested in this -- if for no other reason than making remote support easier. I've never had luck with Remote Assistance and my father's computer. It always disconnects after a few seconds. So, anything that is free and allows me to actually view his desktop live would be a welcome addition to my toolbox. I can also see it being useful for more adhoc meetings and such where products like WebEx or Live Meeting aren't practical or available.
More information here.
Requirements:
A computer with a 700 MHz processor or higher that meets the following requirements:
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Operating system : Microsoft Windows XP Service Pack 2 (SP2) or Windows Vista
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Memory: Minimum 256 MB of RAM (512 MB recommended)
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Hard disk: 10 MB of free hard disk space
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Display: Minimum 800 × 600 screen resolution (1024 × 768 recommended)
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Applications: DirectX 8.0 or higher installed on your computer.
No 64 bit support.