Yahoo's is "Slurp"
Cuill's is "Twiceler"
It makes sense have a friendly robot user agent, so nervous webmasters won't ban it. You don't want to call your crawler 'sitejacker' or something.. Unfortunately my favorite candidates were:
"Oh no! It's CrawlHammer!!"
If even in your heart you hide the urls ... there it shall rake for them...
Does anyone know what the purpose of a '+' in front of an url in the robots user-agent is? Some sites put in the '+', others don't...
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
Mozilla/5.0 (compatible; Ask Jeeves/Teoma; +http://about.ask.com/en/docs/about/webmasters.shtml)
Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp)
Mozilla/5.0 (Twiceler-0.9 http://www.cuill.com/twiceler/robot.html)