Okay, to get you started, you need to put the filename of your php script in the action="" of your HTML form (like so, I also removed the duplicate name attributes you had on several fields)
HTML Code:
#form {width: 360px; background-color: #ccc;
border: 1px dotted #333; padding: 5px;
margin: 0px auto;}
div.row {
clear: both;
padding-top: 5px;

div.row span.label {
float: left;
width: 100px;
text-align: right;

div.row span.formw {
float: right;
width: 235px;
text-align: left;

<div id="form">
<form name="wordressposter" action="myphpscript.php" method="post">
<div class="row">
<span class="label">Title: </span><span
class="formw"><input name="title" type="text" size="25" /></span>
<div class="row">
<span class="label">Comments: </span><span class="formw">
<textarea cols="25" rows="8" name="article"></textarea>
<div class="row">
<span class="label">Tags: </span><span
class="formw"><input type="text" size="25" name="keywords"/></span>
<div class="row">
<span class="label">Categories: (separate with commas)</span><span
class="formw"><input type="text" size="25" name="categories"/></span>

<div class="spacer">
Then you need to update your PHP script to use the form elements
PHP Code:
$client = new IXR_Client('http://MYSITE.org/xmlrpc.php');  

if (!
'An error occurred calling wp.getCategories - '.$client->getErrorCode().":".$client->getErrorMessage());  
$response $client->getResponse();  

$content = array(  

var_dump($content); // paste the output of this back to the forum for us to review.

if (!$client->query('metaWeblog.newPost','''WHERE-I-PUT-MY-WORDPRESS-USERNAME','WHERE-I-PUT-MY-WORDPRESS-PASSWORD'$contentfalse)) {  
'An error occurred calling metaWeblog.newPost - '.$client->getErrorCode().":".$client->getErrorMessage());  
$client->getResponse(); //with Wordpress, will report the ID of the new post  
Now I am making a few assumptions, 1) I am assuming the WordPress API will sanitize the data because the examples found on http://life.mysiteonline.org/archive...d-XML-RPC.html do not tell me that I need to sanitize the data. 2) I am assuming allow_comments and allow_pings are a true/false field and since the form doesn't specifically ask, I hard coded them to true.