A lot of us SharePoint developers know the differences of features between Windows SharePoint Services and SharePoint Portal Server 2003 but it never hurts to point them out again for those who don't know.
As stated in MSDN:
Windows SharePoint Services
is a collection of services for Microsoft Windows Server 2003 that you can use to share information, collaborate with other users on documents, and create lists and Web Part pages. You can also use Windows SharePoint Services as a development platform to create collaboration applications and information-sharing applications.
SharePoint Portal Server 2003
is a scalable, enterprise portal server that is built on Windows SharePoint Services. You can use SharePoint Portal Server 2003 to aggregate Windows SharePoint Services sites, information, and applications in your organization to a single portal.
SharePoint Portal Server 2003 includes all features of Windows SharePoint Services and has some additional features. The following table compares the features between the two:
| Feature |
Windows SharePoint Services |
SharePoint Portal Server 2003 |
| Alerts |
Yes |
Yes |
| Browser-based customization |
Yes |
Yes |
| Discussion boards |
Yes |
Yes |
| Document libraries |
Yes |
Yes |
| Document Workspace |
Yes |
Yes |
| Meeting Workspace |
Yes |
Yes |
| Lists |
Yes |
Yes |
| BizTalk integration |
No |
Yes |
| Microsoft FrontPage 2003 integration |
Yes |
Yes |
| Microsoft InfoPath 2003 integration |
Yes |
Yes |
| Surveys |
Yes |
Yes |
| Templates |
Yes |
Yes |
| Web Part pages |
Yes |
Yes |
| Automatic categorization |
No |
Yes |
| Audiences |
No |
Yes |
| Topic areas |
No |
Yes |
| News |
No |
Yes |
| Personal sites |
No |
Yes |
| Shared services |
No |
Yes |
| Single sign-on |
No |
Yes |
| Site directory |
No |
Yes |
| User profiles |
No |
Yes |
This information came from the following MSDN article:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;830320
If you need more information for your decision of deployment read the following white paper: "Deciding When to Deploy Microsoft Windows SharePoint Services and Microsoft Office SharePoint Portal Server 2003"
The relationship between Windows SharePoint Services and SharePoint Portal Server 2003 is described in the following article: