Nothing so far...in the past I fielded some angry (and vile, and often anonymous) phone calls, but they mysteriosly stopped all at once after one particular call. The guy told me "You'd better watch what you write about [Kerry Band of Brothers member] Jim Wasser," and I responded, "You're a brave guy, calling me and threatening me with a blocked number. If you ever come over here and try to make good on that threat, I guarantee you'll need a coroner when I'm done with you."
Like I said, no more calls after that...