Yep, there's plenty of 'em.
Haven't been able to find too much about hhn or knotts so far but every weekend that passes there should be a lot more.
There's also this from themeparkreview.
USH - Halloween Horror Nights 2010 Media Day - Theme Park Review
Have a couple from the blog -
[K]USH- Universal Studios Hollywood Blog Post Topic Halloween Horror Nights 2010 Coverage
I just posted some.