User-Agent: Googlebot
Allow: /

#recommended by Site Pro News article by Mike Banks Valentine of Publish101.com:

User-Agent: msnbot
Crawl-delay: 10

User-Agent: Teoma
Crawl-delay: 10

User-Agent: Slurp
Crawl-delay: 10

User-Agent: aipbot
Disallow: /

User-Agent: BecomeBot
Disallow: /

User-Agent: psbot
Disallow: /

# this identifies the wayback machine User-Agent: 

User-Agent: ia_archiver 
Disallow: /

# the NameProtect.com bot
User-Agent: NPBot
Disallow: /