A Tiny MCE plugin which makes writing latex equation easy and WYSIWYG（what you see is what you get）. It converts latex code into image which shows real beautiful latex equations on your post.
It adds an “fx” botton on the wordpress TinyMCE editor, on clicks it the codecogs latex equation editor pops up, where you can edit latex, then click the copy button to copy the equation image back in TinyMCE textarea.
You can also use this editor to only input latex code and let plugins like quicklatex, mathjax or Latex for WordPess to convert it to equation image, you’d better change line 90 in editor_plugin.js 
tinyMCE.activeEditor.execCommand(‘mceInsertContent’, false, ”); 
to 
tinyMCE.activeEditor.execCommand(‘mceInsertContent’, false, ‘\[‘+latex+’\]’); 
inorder to only copy LaTex code to TinyMCE textarea when click the copy button.
I just followed the tutorial written by Greg Winiarski(http://ditio.net/2010/08/15/adding-custom-buttons-to-wordpress-tinymce/) and make codecogs Tiny MCE plugin(http://www.codecogs.com/latex/integration/tinymce/install.php) into a wordpress plugin. Thanks the great guys. If you can make the plugin better to use please tell me in http://www.verymath.com/2011/05/10/codecogs-latex-equation-editor/
<h3>Arbitrary section</h3>
You may provide arbitrary sections, in the same format as the ones above. This may be of use for extremely complicated 
plugins where more information needs to be conveyed that doesn’t fit into the categories of “description” or 
“installation.” Arbitrary sections will be shown below the built-in sections outlined above.
<h3>A brief Markdown Example</h3>
Ordered list:
<ol>
<li>Some feature</li>
<li>Another feature</li>
<li>Something else about the plugin</li>
</ol>
Unordered list:
<ul>
<li>something</li>
<li>something else</li>
<li>third thing</li>
</ul>
Here’s a link to <a href="https://wordpress.org/" title="Your favorite software" rel="ugc">WordPress</a> and one to <a href="http://daringfireball.net/projects/markdown/syntax" title="Markdown is what the parser uses to process much of the readme file" rel="nofollow ugc">Markdown’s Syntax Documentation</a>. 
Titles are optional, naturally.
Markdown uses email style notation for blockquotes and I’ve been told:
<blockquote>
Asterisks for emphasis. Double it up for strong.
</blockquote>
<pre><code><?php code(); // goes in backticks ?>
</code></pre>

Codecogs Latex Equation Editor

Adds codecogs WYSIWYG LaTex equation popup editor to wordrpess TinyMCE editor.

advanpix

cityjin

kirkpatrick

Insert formulas & graphics in the posts and comments using native LaTeX shorthands directly in the text. Inline formulas, displayed equations auto-numbering, labeling and referencing, AMS-LaTeX, <code>TikZ</code>, custom LaTeX preamble. No LaTeX installation required. Easily customizable using UI page. Actively developed and maintained. Visit <a href="http://www.holoborodko.com/pavel/quicklatex/" rel="nofollow ugc">QuickLaTeX homepage</a> for more info.
<ul>
<li>Standard LaTeX expressions can be cut and pasted directly into WordPress posts, pages, and comments; display environments require no enclosures, other expressions require only a surrounding <code>$..$</code> or <code>\[..\]</code>. No need for enclosing tags <code>[latex] ... [/latex]</code>.</li>
<li>Correct vertical positioning of inline formulas relative to baseline of surrounding text. Say “NO” to jumpy equations produced by other plugins!</li>
<li>SVG vector graphics support, so that formulas are crisp regardless of scaling in browser.</li>
<li>(AMS)LaTeX displayed math environments support: <code>equation, align, gather, multiline, flalign, alignat,</code> etc.</li>
<li>Automatic numbering of displayed equations. Override autonumbering with <code>\tag{}</code> LaTeX command.</li>
<li>Equation hyper-referencing by standard LaTeX rules with <code>\label{}</code>, <code>\ref{}</code>.</li>
<li>Custom LaTeX document preamble, allowing added <code>\usepackage{}</code> and <code>\newcommand{}</code>.</li>
<li><code>TikZ</code> and <code>pgfplots</code> graphics package support.</li>
<li>Preview formulas in comments before publishing. Additionally <a href="http://blogwaffe.com/ajax-comment-preview/" rel="nofollow ugc">AJAX Comment Preview</a> plugin should be installed to enable this feature.</li>
<li>Meaningful error messages for mistakes in LaTeX code.</li>
<li>Precise font properties tuning: <code>size, text and background color</code>. </li>
<li>Easy style customization using UI or CSS file.</li>
<li>No LaTeX installation is required. </li>
<li>QuickLaTeX.com automatically provides formula images, which are then cached on user’s server.</li>
<li>Administrative settings page for setting global parameters; AJAX-ified.</li>
</ul>
Just place LaTeX math expressions into your text and enable QuickLaTeX on the page by <code>[latexpage]</code> command. 
WP QuickLaTeX will convert them to high-quality images and embed into post. Inline formulas will be properly aligned with the text. 
Displayed equations will be auto-numbered by LaTeX rules. 
To see plugin in action please visit math-pages on my blog, e.g. <a href="http://www.holoborodko.com/pavel/numerical-methods/numerical-derivative/central-differences/" rel="nofollow ugc">Central Differences</a>, 
<a href="http://www.holoborodko.com/pavel/numerical-methods/numerical-integration/cubature-formulas-for-the-unit-disk/" rel="nofollow ugc">Cubature formulas for the unit disk</a>, <a href="http://www.holoborodko.com/pavel/numerical-methods/numerical-derivative/smooth-low-noise-differentiators/" rel="nofollow ugc">Smooth noise robust differentiators</a>, etc.

WP QuickLaTeX

Advanced LaTeX plugin. Native LaTeX syntax. Allows custom preamble, TikZ and other packages. Zoom-independent visual quality (SVG).

Codecogs Latex Equation Editor vs WP QuickLaTeX