Features of Sharepoint

Check the Capabilities of MOSS
http://www.microsoft.com/sharepoint/capabilities/default.mspx

What is Sharepoint Server
http://www.microsoft.com/sharepoint/prodinfo/what.mspx

Product Comparision Chart
http://download.microsoft.com/download/1/d/c/1dc632e8-71e1-466f-8a2f-c940f1438e0a/SharePointProductsComparison.xls
This Excel file will give you an idea of the features MOSS support

- Syndication (RSS and ATOM) - Yes and Inbuilt support for RSS and how to Manage RSS
http://office.microsoft.com/en-us/sharepointserver/HA100214251033.aspx
- Support to Web Clipping - Yes
- Implement different kinds ok workflows, for example to approve some content update and this has to be approved - Supported

You can use Inbuilt Workflows or Create Custom Workflow using Sharpoint Designer / Visual Studio

see Developer Introduction to Workflows for Windows SharePoint Services 3.0 and SharePoint Server 2007
http://msdn.microsoft.com/en-us/library/aa830816.aspx

- Support for most know Web Browser (Is there any identified problem with anyone)
See - http://www.andrewconnell.com/blog/archive/2006/05/17/3115.aspx and http://technet.microsoft.com/en-us/library/cc263526.aspx

- In-Built Statics
http://technet.microsoft.com/en-us/library/cc262541.aspx
and You can Use Sharepoint Designer for Site Statistics ( Sharepoint Designer is Free Now www.microsoft.com/spd )

http://office.microsoft.com/en-us/sharepointdesigner/HA101741361033.aspx and here http://www.bluedoglimited.com/SharePointThoughts/ViewPost.aspx?ID=129
- autoeliminate bot traffic

- integrate easily custom security (any experience with this)
http://technet.microsoft.com/en-us/library/cc262331.aspx

- Taxonomy support for searching within sharepoint
http://blogs.msdn.com/ecm/archive/2007/01/22/taxonomy-tagging-starter-kit-for-sharepoint-server.aspxhttp://www.mindsharpblogs.com/bill/archive/2006/07/06/1196.aspx

- Metadata management
Managing Enterprise Metadata with Content Types -
http://go.microsoft.com/fwlink/?LinkId=101604&clcid=0x409


To Know More Check this Link
http://sharepoint.microsoft.com/blogs/GetThePoint/default.aspx
and this site discuss these features

Branding
Building Solutions
Business Intelligence
Business Processes
Calendaring
Collaboration
Compliance
Design
Education
Feedback
Lists and Libraries
People Wrangling
Planning & Process
Productivity
Publishing
Search
Site Admin
Social Networking
Team Sites
Training
Web Parts

--Source,
blog