Rich Finn

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.SharePoint;
using Microsoft.Office.Server.Search.Administration;
using System.Diagnostics;

public class FeatureReceiver : SPFeatureReceiver
{
    SPSite currentSite = null;
    public override void FeatureActivated(SPFeatureReceiverProperties properties)
    {
        //Debugger.Launch();
        this.currentSite = properties.Feature.Parent as SPSite;
        createCrawlRules();
    }

    private void createCrawlRules()
    {
        //get the site SSP's search server instance
        SearchContext searchContext = SearchContext.GetContext(this.currentSite);

        //For this example, I'll just show how to exclude the Explorer view of a list
        //Notice how we're using wildcard characters to specify that every /Forms/WebFldr.aspx page
        //    will be excluded regaurdless of protocol or location in the site collection
        string crawlRule = " *://*/Forms/WebFldr.aspx";

        //get the content source for the search server
        Content sspContent = new Content(searchContext);

        //check to see if the crawl rule exists, and create it if it doesn't
        if (!sspContent.CrawlRules.Exists(rule))
        {
            

            //create the crawl rule, setting the type of crawl rule and the crawl rule string
            CrawlRule crawlRule = sspContent.CrawlRules.Create(CrawlRuleType.ExclusionRule, rule);

            //we want to make sure that the rule still works if there are querystring variables
            crawlRule.FollowComplexUrls = true;

            //at this point, you can set other properties such as authentication information to crawl
            //    content using a different identity or authentication method
            //    for more info , check out http://technet.microsoft.com/en-us/library/cc263150(TechNet.10).aspx

            //commit the rule in the database
            crawlRule.Update();
        }
    } 
public override void FeatureDeactivating(SPFeatureReceiverProperties properties){} 
public override void FeatureInstalled(SPFeatureReceiverProperties properties){} 
public override void FeatureUninstalling(SPFeatureReceiverProperties properties){}       
}