Being a non-techie, I'm the perfect person to write about tech things. I learn about them well after the fact and love to share them with other "slow learners." I figure if I just heard about it, it is entirely possible I might not be the absolute last to find out...
These have to do with researching on the web. In Google, you can type site:edu (subject) and get a list of websites that end in edu and reference the subject. For example, if you type site:edu Barak Obama you get a list of all education sites referencing Barak Obama. You could also type site:com (subject) and get a list of all commercial websites referencing the subject. You can also type filetype:ppt (subject) and get a list of all PowerPoints (or other file types, like doc) referencing the subject.
Have you ever typed in a URL only to find the website no longer exists? Wayback Machine, an Internet archive site, will find old URLs and deliver the archived website. Here's how it works: when you go to the Wayback Machine website, you enter a URL that no longer works, like Tweeter.com (remember they used to sell speakers and other audio equipment?). Then, you get a timeline that shows when the website was active and when it went under. If you click on any of the years it was active, you get a calendar with certain dates highlighted by blue dots. Clicking on a highlighted date will get you to a screen shot of what the company's webpage looked like on that date.
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