What do you use for remotely testing users of an alpha web app?

Our perfect solution would be a web based service that users are directed to complete a task, with both their screen recorded and a webcam/audio stream to match. Closest service we've found was openhallway.com - but it's Java based and I had trouble getting it working reliably.

Is there a flash based / html5 service that you would recommend? And more broadly what are your thoughts on remote testing?

Other contenders: - http://www.loop11.com (no video recording features) - http://silverbackapp.com (mac only)