The blog post has a GIF of code intelligence (hovers, go-to-definition, and find-references) in a diff. There's another nifty animated GIF on our homepage showing the code intelligence integration for GitHub: https://about.sourcegraph.com/. Our new tour at https://about.sourcegraph.com/docs/tour has some links to try it out on open-source code (although for the real experience, you can follow the steps on our homepage to run it inside your own organization to use it with your internal code). And check out the overview/FAQ at https://about.sourcegraph.com/docs/overview.
Finally, we have an awesome team based in SF and around the world (Arizona, South Africa) building Sourcegraph. We're growing quickly as more devs bring Sourcegraph into their companies and their companies adopt Sourcegraph (we can show you nice-looking charts :). If you want to learn more about joining the team, email me at email@example.com with the thing you'd most like to improve about or add to Sourcegraph.
That's what I'm really after... it was a super useful tool for finding working examples across gazillions of LoC.
Of course, we like to think we take things further, with support for more languages, connecting your code to all the open-source code you probably use, and integrations for most major code hosts and review tools. If you try it out, we'd love to hear from you and how you think it stacks up to the code search you used at Google :)