Ever wonder if you're looking at Linux or Microsoft driven website? There are two ways to figure this out. The best way: go to Netcraft.co.uk put the domain name into the "What is that site running?" The fast way: change the case of one character in page name (e.g from "index.htm" to "Index.htm"). If you can see the same page, it's a Microsoft page. If you get a "Page Not Found" it's a Linux page.
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Your prospective client will say, "Can you redesign the site for me? I wanted it to show off a new quote on the front page everyday."
You say, "Sure. Is this a Linux or Microsoft driven site?"
They say, "Duh... I dunno."
You pull this casing trick and you get a feel for if you can grab a PHP to do what he wants of if you have to look for a Microsoft equivalent.
Another example:
Prospective client says, "Can you host my site?"
You say, "Sure. Is this a Linux or Microsoft driven site?"
They say, "Duh... I dunno."
The "Duh... I dunno." is about the most common response I see out of prospective clients. :)