The site: operator for Google search is pretty useful in getting search results from a targeted site. But it is pretty painful to type the operator site:example.com search term.
Recently Google introduced the the "AT" operator which is very useful to get more results from a spefic site. This works similar to the site: operator, but shows less results from the targeted site plus the result from other sites. Also, this syntax is too easy. Just the typing, google voice at lifehacker will return results from lifehacker.com.
Also, in this case, the TLD don’t need to be typed. This is a time saver also.
See in action