Consider using a full version of SQL Server 2000/2005 for any WSS implementation with greater than 10 sites.
Use document versioning sparingly in WSS document libraries to ensure that the SQL database does not grow too large.
Keep a WSS SharePoint Server up to date with all Windows Server 2003 and SQL Server patches and updates to reduce the risk of attacks or malfunctions.
Deploy WSS Server(s) to replace file servers for document storage to take advantage of the newly integrated document management features WSS offers.
Keep the number of virtual servers created per WSS Server to 10 or fewer to avoid performance degradation.
Use FrontPage 2003 to provide advanced administration, site maintenance, and backup and restore capabilities.
Update WSS with Service Pack 2 to take advantage of the SQL 2005 support, updated patches, and advanced extranet support.
Use the full SharePoint Portal Server 2003 application when you need to add enterprise-level management and organization tools to WSS sites, or to consolidate information from various systems into a centralized portal.