Can someone give me an example of a robots.txt that allows Google, Yahoo, MSN (bing), ASK, and Google Adwords, but blocks all others. (Are there any other good robots that I may want to add to this list?)
Is this a wise way to go? Can you block bad robots that ignore the robots.txt? I just saw a robot called 80legs scrape my site, so I think its time to block these robots that can do no good.