I think you made the good (safe) choice here, but I got a weird feeling about this one...
In the MPAA press release, they say that they filed the lawsuit against niteshadow.com, not niteshdw.com (an error in an official press release???). Plus, niteshadow.com domain exist since 2000 and seem to be down (showing control panel defautlt page). Plus, you still haven't receive any legal convocation. Downside, website description mostly match niteshdw.com.
I'm just hoping for you that they are really suing niteshadow.com and not you :)