carsonified.com - blogs about a high availability website:

"It's all about expensive redundant hardware with top of the line load balancers and an enterprise class SAN, right? Well, not necessarily.

There are several cheap or free steps you can take to ensure uptime before you splash your cash on lots of kit. If you’re not taking these steps you are wasting your money on your redundant hardware. Here are my top five things that bring sites down, in rough order of likeliness …"

My thoughts on this?

Well it all just common sense advise that some developers sometimes need to be reminded of.

For example when your developing a website with dynamic interfaces - using JS it's prudent to ensure that when the javascript is disabled on a clients machine, the page degrades gracefully - so that visitors can still use your site.
With that said, Jonathan expands on all of this by explaining exactly why - while giving examples.

 You can't fault this blog really.