It seems to be easy, but to delete WSS sites you have to do 3 things:
1. Remove the physical path
Go to your WSS site > Site Settings > Go To Site Administration > Management and Statistics > Delete Site
2. Remove the link to the WSS site
Go to SiteDirectory (http://server/SiteDirectory/Lists/Sites/Summary.aspx) > Manage Sites
3. Exclude the site of the search results
Portal > Site Settings > Configure search and indexing > View sites pending approval for indexing
Your WSS site has been deleted successfully!