Enable People Search for Sharepoint site

1. open your Central Administraion
2. open your SharedServices Provider
3. within the Search Settings go to Content Sources and Crawl Schedule
4. edit the "Local Offices SharePoint Server Sites"
5. within "Start Addresses" enter the following URL to activate and index "People Search"

sps3://YourSiteUrl/

6. After entering the "sps3://YourSiteUrl" start a full crawl and enjoy the people search!