Adding a new metadata property to search

Scenario:
You want to add new Managed Properties to the SharePoint Search results.

Solution:
Shared Service Administration Web Application provide you the options to add new Managed Properties

Steps:
1. Navigate to Central Administrative Web Application
2. Click on 'SharedServices1' link from the left navigation
3. Click on 'Search Settings'
4. Click on 'Metadata property mappings'
5. Click on 'New Managed Property'
6. Type a Name for the property and select the Type
7. Click on the 'Add Mapping' button from the bottom section
8. Search for the property or the column name , you want to map.
Note: If you are not able to find the column name or property you want to map, full crawl might be required for SharePoint Search to pickup the proprty.
9. Click 'OK' Button to add it
10. Run a full crawl for the Content Source containing the column infomation

Article:
http://sharepointmagazine.net/technical/customisation/customizing-search-series-creating-new-managed-properties-from-bdc-crawled-content