You may have noticed that if you create a List or Library and want to view them on SharePoint 2010, then even though you've installed Office 2010 64-bit, it won't display the items in DataSheet View.

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That's because you haven't installed 32-bit Office 2010 in the Client Machine. If you're on a development environment or don't want to install Office 2010 32-bit version on a 64-bit platform then you will have to install "2007 Office System Driver: Data Connectivity Components" or "Microsoft Access Database Engine 2010 Redistributable" which also enables DataSheet View in SharePoint Portal.

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DataSheet works like an Access application. So it would be easy for you to record items in your lists or libraries.

Reminder: DataSheet is an ActiveX control so it would work with only Internet Explorer.