Which SharePoint Product?
- Windows SharePoint Services (WSS) 3.0 – Included as part of Windows Server 2003 licence
- Microsoft Office SharePoint server 2007 for Search
- Microsoft Office SharePoint Server (MOSS) 2007 Standard - Offers a more functionality than WSS 3
- Microsoft Office SharePoint Server (MOSS) 2007 Enterprise - Offers all the features of Standard plus more
- Microsoft Office SharePoint Server (MOSS) 2007 for Internet sites – Used for anonymous access websites or extranets with a large number of external users
The below link offers a feature comparison from Microsoft of the differences between these products.
http://office.microsoft.com/en-us/products/FX101758691033.aspx
SharePoint Pricing
I would always recommend you check with your MS vendor (LAR or Partner) rather than budgeting on these figures but they are indicative.
http://office.microsoft.com/en-gb/sharepointserver/FX102176831033.aspx
How has this changed from 2003?
Previously in 2003 version there were 2 versions of SharePoint – SharePoint Portal Server (SPS) 2003 and Windows SharePoint Services (WSS) 2. WSS was included with Windows Server 2003 and SPS was a separately licensable product. There was also an external connector licence for creating SPS 2003 Extranets. There was no separately licensable search version.