Here's one to start you off...
Alexa=ia_archiver
AllTheWeb=crawler@fast
AllTheWeb=FAST-WebCrawler
AltaVista=Mercator
Altavista=Scooter
Ask.com=Ask Jeeves
Ask.com=teoma_agent1
AskJeeves=AskJeeves
BecomeBot=BecomeBot
BoardReader=BoardReader
Crawler.de=Crawler
EntireWeb.com=Speedy Spider
Entireweb=Speedy Spider
Excite=ArchitextSpider
Gigablast Gigabot=Gigabot
Gigabot=Gigabot
Google Adsense=Mediapartners-Google
Google Images=Googlebot-Image
Google Mobile=Googlebot-Mobile
Google=Googlebot
Infoseek=InfoSeek sidewinder
InfoSeek=UltraSeek
Inktomi=Slurp
Looksmart=MantraAgent
Lycos=Lycos_Spider_(T-Rex)
MJ12bot=MJ12bot
MSN=MSNBOT
Naver.com=Yeti/
NaverBot=NaverBot
NorthernLight.com=Gulliver
ScrubTheWeb=Scrubby
Search Hippo=Fluffy the Spider
SingingFish=asterias
Snapbot=Snapbot
SnapPreviewBot=SnapPreviewBot
Sogou=sogou web spider
StackRambler(ru)=StackRambler
TAMU.edu=IRLbot
Teoma=TeomaAgent
TMCrawler=TMCrawler
Twiceler=Twiceler-0.9
Voila=Voila
Voyager=Voyager
Webcrawler.com=WebCrawler
Whois.sc=SurveyBot
Wisenut=Zyborg
Yahoo=Yahoo! Slurp
YodaoBot=YodaoBot
