Re: New search engine for sailboats
Perhaps you have good intentions. And I see the real value in your project – I would gladly use it myself...
However, Google search "cross-site scripting" (XSS) or check Wikepedia: en.wikipedia.org/wiki/Cross-site_scripting. Or better yet - read the Security and Abuse sections in the OAuth link you've provided yourself.
At this point you are saying “just trust me”.
I work in IT, and XSS vulnerability is something I have to deal often. You can accomplish what’re trying to using old-fashioned cookies, sessions and other methods.
Your website will gain more trust and loyal followers if you will not require its users to surrender their Gmail accounts.
Wish you luck with your project.