Search Technologies for SharePoint 2010 Products - Vedant Kulshreshtha - Site Home - TechNet Blogs

"When compared to SharePoint 2007, one more search technology option - FAST Search Server 2010 for SharePointhas been added to SharePoint 2010 product family. Options now available are:

1. Microsoft SharePoint Foundation 2010 search
2. Microsoft Search Server 2010 Express
3. Microsoft Search Server 2010
4. Microsoft SharePoint Server 2010
5. FAST Search Server 2010 for SharePoint"

Search Technologies for SharePoint 2010 Products - Vedant Kulshreshtha - Site Home - TechNet Blogs

This is a excellent blog post on seeing the strength of Fast search, a must read.