I've written about developer Saied Ghaffari and his company It's About Time before; well, they have another new Mac app that's pretty amazing, and the great thing is that TUAW readers can get a free sample of the app right here, right now. The new app is called Hello Tips, Tricks & Secrets (US$1.99) and it's full of OS X tips that you might not know -- including a bunch of new tips especially for OS X Mountain Lion. Saied made ten tips available in the sample web app that I've embedded below, but there are over a hundred tips in the Mac app, all presented in an easy-to-understand video format. Give the example below a try (click the Next button to start cycling through the tips), and then consider buying the app. It's a great way to learn some tips that you can show off to your friends and relatives, and they'll end up thinking you're an amazing Mac whiz!