I use a couple of them all the time (especially site:), but I definitely spotted a few that will be extremely helpful:
- +[stop word] - having the plus sign before a "stop word" (such as +not) forces the search to include that word, instead of ignoring it
- inurl: and intitle: - similar to site:, but this limits the search to words just in the web address or title field. Very useful for increasing relevancy on obscure information
- related: - lists websites that are "related" to the domain you search for (ie, related:swissarmylibrarian.net). This seems just oddly interesting, but there has got to be a very good application
The page also gives some great examples of how these can be combined. It's always good to learn how to search smarter, and it's certainly a conversation starter when patrons see me typing in these weird codes and getting better results than they do - always on the lookout for those teaching moments.