Are there any programs for Ubuntu that can pull TV streams from the Internet? I have in mind programs that work like the apps that come installed on blu-ray players — BBC iPlayer, Hulu and/or YouTube.

I know XMBC can but it's too fiddly and resource-hungry, I just want "net TV" apps and not a full media center. Boxee was great for this; it was a media center but it had an interface for the apps and didn't just stick them in some strange menu as XBMC does.