Microsoft unveiled it's latest offering for Search within the enterprise by offering "Search Server Express"
Search Server Express can be downloaded for free from here:
Yes this is a free product that you don't need to pay a license for. You'll need Windows Server and all other pre-requisites which of course you'll need to pay.
Feature blurb from MS
- Go from downloading to searching in minutes with a streamlined installation experience, making it easy to get an enterprise search infrastructure running in your environment quickly.
- Review common administrative tasks, status, and settings in a single view using a unified administrative dashboard.
- Manage content sources, search scopes, authoritative sources, key words, best bets and other relevance tuning through a powerful, easy-to-use management console.
- Help ensure only the right people can find information using query and index-time security trimming.
- Monitor search performance and improve search relevance with query and results reporting.
The Enterprise Search blog has also more info: http://blogs.msdn.com/enterprisesearch