Some of the most frequent questions I get as a SharePoint infrastructure consultant are surrounding licensing. Microsoft Licensing is notorious for being complex and SharePoint licensing is no exception. The tables below will provide high level guidance surrounding licensing SharePoint in an Intranet and Extranet scenario.
Intranet: The following table describes the necessary licenses for internal users on a SharePoint environment. All licenses listed in the row of the selected product are required.

Extranet: The following table describes the additional licenses required to license SharePoint for external users (non employees). There are two options (A or B) for each SharePoint versions depending on the number of users and deployment scenario.
Design Tip: In order to reduce cost, it is common for organisation to use two separate farms: MOSS 2007 Std internally and WSS 3.0 for external collaboration.
Useful Links:
SharePoint version information: http://office.microsoft.com/en-us/products/FX101865111033.aspx
SharePoint FAQ: http://office.microsoft.com/en-us/sharepointserver/HA101655351033.aspx
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