Do you make use of your hosts file?
I'd completely forgotten that a hosts file can be useful, but the other day I was reminded when I was tasked with finding a simple way to block some web-content without using an ad-blocking extension. I remembered that it's an easy way to block ads and other content without loading that content in the first place (using chrome right now, and the adblocking extension I use loads ads before hiding them).
Do you guys use your hosts file for such purposes? How about your own (or public) DNS servers?
Any other nifty tricks you can share? :)