Lifehacker veterans will know the "site:" operator you can use to only search Lifehacker within Google. Apparently, someone told Google about this trick, so now the company has built it right into search results itself.
If you're tired of typing "site:lifehacker.com.au" you can create custom search engines in Chrome. However, if you don't search a specific site frequently (or want to teach a less tech-savvy person how to do so), just enter the name of a site in Google. Last month, the company quietly added a search box in the list of results that will perform the "site:" operator itself.
This isn't a revolution in usability, but it does put an incredibly powerful tool a bit closer to the hands of those who may not instinctively use search operators in daily life.