[MattLaroche]

Which grammar guidelines suggest not capitalizing a verb in a title?

[buster]

Apparently there are none, but there are rules followed by some papers..

http://grammar.about.com/od/rs/g/Sentence-Case.htm

[MattLaroche]

So the AP follows sentence case for titles, but this one follows title case for titles. And in title case, which is another rule, would endorse capitalizing "Go" here.