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Did you ever wanted to know how many characters you type in the content area? 
Now you know.
Credits go to: <a href="http://konstruktors.com/blog/wordpress/3685-limit-number-words-characters-in-wordpress-editor/" rel="nofollow ugc">Konstructor</a> and <a href="http://www.ilovecolors.com.ar/character-counter-excerpt-wordpress/" rel="nofollow ugc">ilovecolors</a>.

Content character count live

Counts charaters live while you write your content. Works for any kind of "post type" out of the box.

edik

Some WordPress functions outputs character entity references. The most of these are not allowed in XHTML. So if your WordPress installation uses the mime type ‘application/xhtml+xml’, the generated sites could have invalid xhtml code and the browser would display the syntax error page.
Convertentity converts all entity references into their corresponding characters with the exception of the references for the following characters: ‘<>&”
Theses references are the only ones which are allowed in XHTML.

Convertentity

Converts all character entity references, which are forbidden in XHTML, into their corresponding characters.

Content character count live vs Convertentity