I had said that I wanted an easy way to use latex on blogspot. Untill now I was using an external mimetex server and using the html img tag with the url of the mimetex cg and latex code in it. The idea was to create some kind of customized tag that would write the html code. That has too good points. On one hand it makes the edition of the post easier. On the other if the mimetex cg is changed you only need the link of the cgi in the script code that is asociated to the tag.
One bad aspect of the latex, as I use it in this blog, is that the images have some annoying borders, as you can see: