Several users who saw the announcement of support for the Hauppauge USBLive2 several months ago reported in the blog comments that the support became broken in the mainline kernel.
After finally getting some time to investigate, I did confirm that there had been a regression, identified the issue, and have submitted a patch for upstream inclusion.
The patch can be found at the following link. It can be applied against the current media_build tree, as well as the 3.0.0 kernel.
Thanks go out to Robert DeLuca for sponsoring the development of a fix for this issue.
Comments/feedback welcome, as always.