You can also use it to get ideas for web content, since there are all these very specific questions up on the site. If people are asking them on Quora, they must be typing them, and ones like them, into Google, right?
And you can use it in a geo-specific way, too. You can get the ball rolling by typing in a geo-specific keyword and seeing what turns up. For instance, here's what's listed for Sydney. You can see that those results cover numerous different subjects that are related in some way to that city. If you use a bit of free association you can use these questions to come up with others that relate to your website, no matter what niche it is in.
For example, there's a question about where the best boxing clubs are in Sydney. That's given me an idea for a blog post for this blog. I could do some research and write a post about the best SEO companies in Perth, for example.
And it's not just locations that can be used in this way. I'm interested in politics and have a couple of blogs about the subject. So I saw what people are asking about Australian PM Julia Gillard. There aren't that many questions there, but there's one that I could use directly about whether she has any chance of winning the next election. There are other questions about how her visits and speeches have been perceived internationally. Also good fodder for blog posts.
You could do this with the names of high profile people in any field. As long as they are based in Australia you'll come up with ideas that would be most appealing to Aussies. You could also do the same thing with local products, services, organizations, businesses.
This approach is a bit hit and miss. Not all of these posts will draw traffic. But some will for sure. And you'll still be adding relevant and interesting content that Google will index. That has to be a good thing for your site's SEO in the long term.