Here is a simple way to add simple math to a web site such as this one and blogger.com using the following asciimath plugin. The code has been changed a little bit to correct its behavior under safari. Just add the following html/javascript to your blogger template, and you are done!

<script src="http://cse.unl.edu/~kdeng/assets/ASCIIMathMLwFallback.js"
type="text/javascript"/>

Compared to other alternative ways that I have found so far, I think this is better because it is compact (unlike jsmath) and it doesn't need third party browser plugin such as greasemonkey, and it also keeps the original math/latex source.
Check the following code `sqrt sqrt root3x`

There are many things that are easy to get into but hard to keep up. Maintaining a website is one of them. This blog is dedicated to recording the changes of this website, among other things. :)