I made a quickfix for it myself with the Javcode found on Yahoo. I don't know Java, but this seemed to work. Hey, thanks Processing!

You can only search with one word... uhm... not great, but still. Take it from here. It is a really dirty hack, but it works unless you test it extensively. It is not tested etc... I'm on a mac.
If you get how to make decent queries (meaning more than one word :-) please post. I'm out of time here :-) Hope someone finds this helpful as a start...

Here's the code:
/*
Quick and Dirty access to Yahoo Boss search
More info on Yahoo Boss http://developer.yahoo.com/search/boss/
PRESS MOUSE AND THE SEARCH STARTS.
The result is parsed via XML and printed to the console
The querything is weird since it is a url - MEANING no empty spaces in the search...
Anyone got a fix, welcome to post the fix for this. Probably found somewhere on developer.Yahoo.com.
Not sure if you need a API-key, maybe this is the problem...?
It works without this way...
I said Quick and Dirty :-)
*/

import processing.net.*;
import org.apache.commons.httpclient.*;
import org.apache.commons.httpclient.methods.*;
import java.io.*;
import org.w3c.dom.*;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.*;

String newSearch;
int numSearches = 15;
color white = #ffffff;

void setup() {
 size(200, 200);
}

void draw() {
 background(white);
}

void mousePressed() {
 newSearch = "Processing";
 try {
   searchIt("http://api.search.yahoo.com/WebSearchService/V1/webSearch?appid=YahooDemo&query=" + newSearch + "&results=" + numSearches);
 }
 catch(Exception e) {
   e.printStackTrace();
 }

}

void searchIt(String request) throws Exception{


 HttpClient client = new HttpClient();
 GetMethod method = new GetMethod(request);

 // Send GET request
 int statusCode = client.executeMethod(method);

 if (statusCode != HttpStatus.SC_OK) {
   System.err.println("Method failed: " + method.getStatusLine());
 }
 InputStream rstream = null;

 // Get the response body
 rstream = method.getResponseBodyAsStream();


 // Process response
 Document response = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(rstream);

 XPathFactory factory = XPathFactory.newInstance();
 XPath xPath=factory.newXPath();

 //Get all search Result nodes
 NodeList nodes = (NodeList)xPath.evaluate("/ResultSet/Result", response, XPathConstants.NODESET);
 int nodeCount = nodes.getLength();

 //iterate over search Result nodes
 for (int i = 0; i < nodeCount; i++) {
   //Get each xpath expression as a string
   String title = (String)xPath.evaluate("Title", nodes.item(i), XPathConstants.STRING);
   String summary = (String)xPath.evaluate("Summary", nodes.item(i), XPathConstants.STRING);
   String url = (String)xPath.evaluate("Url", nodes.item(i), XPathConstants.STRING);

   //print out the Title, Summary, and URL for each search result
   System.out.println("Title: " + title);
   System.out.println("Summary: " + summary);
   System.out.println("URL: " + url);
   System.out.println("--");

 }  
}