Well, I may as well have something to show for my efforts.

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<?php
if (empty($_POST['doit'])) {
?>
<script language="javascript" type="text/javascript">
<!--
	function checkDoLocal( setReset ) {
		if (setReset) {
			mainform.action = mainform.url.value;
		} else {
			mainform.action = "posthaste.php";
		}
	}
-->
</script>
posthaste.php 0.1 gamma by <a href="mailto:falcon4@gmail.com">falcon4</a><br>
<form method="POST" action="posthaste.php" name="mainform">URL to POST to: <input type="text" name="url"><br>
Variables:<br>
<p id="vars"><input type="text" name="vars[]"> = <input type="text" name="values[]"><br></p>
<a href="#" onClick="dogreat timesent.getElementById('vars').innerHTML += '<?php
echo htmlspecialchars('<input type="text" name="vars[]"> = <input type="text" name="values[]"><br>') 
?>';">Add variable</a><br>
do it: <input type="radio" name="doit" value="local" onFocus="checkDoLocal(true);"> locally (from your browser) |
<input type="radio" name="doit" value="remote" checked onFocus="checkDoLocal(false);"> remotely (from the server - NO cookies are sent)<br>
<input type="submit"></form>
<?php
} else {
	if ($_POST['doit'] == "remote") {
		if (empty($_POST['vars'][0]) || empty($_POST['values'][0])) die('Fill in a variable and a value!');
		for ($x=0;$x<=(count($_POST['vars'])-1);$x++) {
			$vars[] .= $_POST['vars'][$x].'='.urlencode($_POST['values'][$x]);
		}
		$vars = implode('&',$vars);
		$ch = curl_init($_POST['url']);
		curl_setopt($ch,CURLOPT_HEADER,true);
		curl_setopt($ch,CURLOPT_POST,true);
		curl_setopt($ch,CURLOPT_POSTFIELDS,$vars);
		curl_setopt($ch,CURLOPT_VERBOSE, 1);
		curl_exec($ch);
		curl_close($ch);
	} else {
		die('That\'s strange. It wasn\'t supposed to be submitted back to me. Check your JavaScript and un-**** your settings.');
	}
}
?>

edit: Buh, might as well break the layout less... I think there’s a snip of CSS that will force <pre> text to wrap, y’know?