Ustream Viewer maybe 1jaxstate1 ?
Yes it's metro interface seems quite nice but I can't vouch for it's quality as I never use it but it was the only one I knew of so thought i'd mention it to you.
You can let us know if it's any good or not.
Anyone knows what happened with Ustream Viewer? I cna't find it anymore in the marketplace and it's not in Ustream.tv's supported section either? Did they stop?