Mindmeister
<html>
<head>
<title>Mindmeister test</title>
</head>
<body>
<form action="http://mindmeister.com/external/show" target="new" method="POST"
enctype="multipart/form-data">
MindMeister File: <input type="file" name="file[content]"/>
Id: <input type="text" name="file[id]" value="-1"/>
Name: <input type="text" name="file[name]" value="some map"/>
API Key: <input type="text" name="api_key" value="your_api_key"/>
Allow export: <input type="checkbox" name="file[allow_export]" />
</form>
</body>
</html>

standard - live "_template" used without any tricks and layout changes…