Let's share some helpful knowledge...the sorts of things that you're constantly surprised people don't know or that you didn't know, and were really angry/happy to discover. Things that save money and time or just make your life easier, better, happier or more productive...
This thread is sponsored by the self-service till in Sainsbury's, which needs you to click pay, and then go back, and only then does the Meal Deal and all those sorts of offer actually work... there are a lot of threads on MoneySupermarket and various other places moaning about this, and it's a bug Sainbury's don't seem to be in a hurry to fix.
When a website has too much distracting crap on it and you just want to focus on reading, use http://www.readability.com/ and it will strip it down to just be text (rather than all the hyperlinks that your eyes see of choices down the side of the page making your brain short circuit). And if you want to save something to read later on your smartphone or kindle, set-up http://www.instapaper.com
If someone at your work keeps asking questions that they could Google to find the answer, use this http://lmgtfy.com/