At TechEd this year, Arpan Shah shared some MCMS search vendors:
- Coveo – Free for sites with less than 5000 pages. Coveo also has Enterprise Search for SharePoint.
- Snow Valley – Free open source search solution
- SharePoint Search
And some stuff I have come across:
- User controls for MCMS to use SharePoint Portal Server search
- IXIASOFT – XML-based search