Ok i guess i was too impatient. Here is my solution:

<?php

require_once('ripcord.php');

$url = "http://yourodooserver.com";

$db = "yourodoodb";

$username = "youradminuser";

$password = "youradminpw";

$common = ripcord::client("$url/xmlrpc/2/common");

$uid = $common->authenticate($db, $username, $password, array());

$models = ripcord::client("$url/xmlrpc/2/object");

$im = file_get_contents('asdf.jpg');

$imdata = base64_encode($im);

// Product creation

$product_id = $models->execute_kw($db, $uid, $password,

'product.product', 'create',

array(

array(

'default_code'=>"test_default_code",

'name'=>"test_name",

'list_price'=>"100",

'image'=>$imdata,

)

)

);

?>

But I still need help, how can I also add an image to the product?

Thanks,

Michael