Reading my server logs, I noticed 4 hits from Google with the Google Keyword Generator user agent.
64.233.172.1 - - [08/Nov/2009:14:24:20 +0000] "GET / HTTP/1.1" 200 4868 "-" "Mozilla/5.0 (compatible; Google Keyword Generator; +http://www.google.com/bot.html)"
64.233.172.1 - - [08/Nov/2009:14:25:34 +0000] "GET / HTTP/1.1" 200 4867 "-" "Mozilla/5.0 (compatible; Google Keyword Generator; +http://www.google.com/bot.html)"
64.233.172.1 - - [08/Nov/2009:14:25:34 +0000] "GET / HTTP/1.1" 200 4867 "-" "Mozilla/5.0 (compatible; Google Keyword Generator; +http://www.google.com/bot.html)"
64.233.172.1 - - [08/Nov/2009:14:33:44 +0000] "GET / HTTP/1.1" 200 4867 "-" "Mozilla/5.0 (compatible; Google Keyword Generator; +http://www.google.com/bot.html)"
What is this? Is it a new crawler? Is it Google or someone else with a different user agent?

