You're surely aware of how divisive this issue is by just looking at the polling on this matter. By taking a hard stand on a very divisive issue on behalf of your whole company, you are spending an enormous amount of your Google brand and influence on this issue. Right?
According to gaydemographics.org, there are less than 100,000 gay couples in California. Let's assume all of them want to get married. Let's also assume, which I think is reasonable, that those gay couples wanting to get married are already cohabiting, have plenty of food, have shelter, have access to world class health care etc - and after this huge expenditure of Google influence and brand change, that will be the same - but they might have a marriage certificate.
So, I just wonder why you chose that issue over this issue - that of AIDS orphans in Africa (unfortunately that label often hides the fact that these are real living breathing children). According to one.org, there are 12 million children who have lost BOTH parents to AIDS and are on their own now. This is a rapidly growing problem and there are estimated to be 25 million AIDS orphans by 2010. The sheer scale of this disaster is mind-boggling - yet it's mostly an information problem that needs to be solved. These children need parents. There are many couples around the world that are eager for children. Who better than Google to find a solution? For many of these children, adoption would mean hope where now there is only despair. As impactful as a marriage certificate would be to 100,000 gay couples in one of the richest states of the richest country - I'm guessing an adoption certificate would be tremendously more valuable to these children who are truly destitute. And I'm also guessing this would be much more inspirational and unifying to Google's share-holders and users.
In deciding on where to spend your resources, I would suggest watching this: http://www.ted.com/index.php/talks/bjorn_lomborg_sets_global...
and reading this (the irony is not lost on me): http://online.wsj.com/article/SB118124139854628069.html
I can understand the draw to be edgy and controversial, but sometimes the causes which are most worthy also are the least popular. I applaud the work the Google Foundation is doing, don't get me wrong - but please consider the costs vs benefits to Google in working towards these two pieces of paper I mentioned: the gay marriage license for wealthy westerners or the adoption certificate for a destitute, yet living breathing child who has lost both parents in Africa.
Cheers, Matt