If you are running the 64-bit version of Office, then you will most likely see this error when you try to view a list in the Datasheet View...

"The List Cannot be Displayed in Datasheet view..."

This is because SharePoint expects the 32-bit version of the Access ActiveX plugin.  In order to fix this, download the following and install it...

<a title="2007 Office System Driver: Data Connectivity Components" href="http://www.microsoft.com/download/en/confirmation.aspx?id=23734" target="_blank">2007 Office System Driver: Data Connectivity Components</a>