As one might expect in the hubub following Hulu's decision to block Boxee users from streaming its content, a technical work around has now popped up. Over at Lifehacker they've got complete instructions for installing a plugin for XBMC / Boxee that will bring back the brain-softening stream.
It appears to be a relatively simple process that works for both the Apple TV and the Mac versions of Boxee. Of course, there's no telling how long this particular patch will work, though frankly it seems hopeless on the part of Hulu. After all, they have to make their content available to web browsers, so in the end all the XBMC / Boxee hackers have to do is fool the Hulu servers into thinking they're streaming content to a regular web browser's Flash plugin. So unless I'm missing something, from a technical standpoint it seems like as long as the XBMC community is willing to write patches I don't see how Hulu can keep their content locked up. Of course whether they might have some legal recourse is another matter whatsoever.
Update: Apparently the plugin is already broken. Hopefully, a new one will pop up soon.