One of the obvious way is to use captcha. A captcha is a group of generated text that a user must then read and enter to verify themselves as human and not some kind of spam bot.
It was always the case that developers try to develop their own captcha system. Either that’s a way to prove their skills, enjoy satisfaction of a nice work, or simply stupidity and wasting time in doing so is another question. Heck, I’ve even seen source code for bypassing phpBB and SMF captcha floating around the net.
I’ve seen quite a few web apps applying the captcha system provided by Recaptcha. Twitter for example, just did. The API is well written and is provided for free in different programming language – PHP, .NET, JSP, Phyton, Ruby, you name it. There’s also a wordpress plugin made available.
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Windows notepad is fine for opening a single plain text file and for writing a few sentence. It’s definately not the kind of tool that you would want to use for serious purposes.
Here’s a great article that outlines the difference between font types and some general advice on which to use for web designs, copy and printing which I’ve found on 
Here are 5 tips to ensure that you have a pleasant experience and improve your productivity while using VMWare Workstation.
Converting between different units are really tricky sometimes. I always forget them when I was studying engineering and fortunately there’s the calculator to do that.