I found this interesting, so I thought I'd share. As some of you know I've been working to transition my website over to Wordpress (finally) and wanted to complete it before letting Google know the new site existed. You can see it here: www.data-medics.com/recovery/
I hadn't posted a single link to it anywhere on my site, or elsewhere for that matter so there's no reason google should have found it. But it did find it and began indexing the pages. The only place online I'd ever typed in the URL was in Google's Page Speed Insights tool when I was testing out my caching system. So apparently URL's typed into the tool get indexed by Google. Might come in handy when you're looking to quickly get some new content crawled.