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There are several GUI programs allowing different "tricks" on OS X but one of the tricks - enabling Debug menu in Safari, is too easy to require an extra mile of installing a GUI application.

Debug menu in Safari delivers a wealth of additional information, essential for web developers, web designers and other enthusiasts. Using it you can examine DOM, get web page metrics, change user-agent etc.

To enable Debug menu, open Terminal window and type:
$ defaults write com.apple.Safari IncludeDebugMenu 1
Restart Safari
enjoy :)

Roman Mittermayr wrote an awesome article about main trends of Web 2.0 and what makes a website design Web 2.0-ish.

Highly recommended reading.

Say you have a user account on server1 and want to create user on server2 with the same credentials, but you do not actually know the password of that user.

on server1, you can see the encoded version of the password with:
> grep username /etc/shadow | awk -F: {'print $2'}

and then

• create user on the destination server (server2).
• paste the encrypted password in /etc/shadow, on the destination server.

I was just reading Valachi Papers and one passage was too funny not to share. I hope you will enjoy it as well :)

The passage starts by describing a Senate hearings of one Valachi, the first Cosa Nostra insider that gave informatio to FBI, the person who actually first confirmed that the name of the organized crime organization was Cosa Nostra, indeed. And then it continues:

"... Nebraska's senator Carl Curtis asked Valachi about the state of organized crime in Omaha. After a moment's reflection Valachi carefully cupped his hand over his mouth, turned to a Justice Department official sitting next to him and whispered something. Those viewing the scene could be forgiven for supposing senator Curtis had hit on a matter of some importance which Valachi wanted to check out before answering.

He was in fact asking, "Where the hell is Omaha?"