I had this happen to me last year. It was a woman in my very own small neighbourhood in Toronto who was the perpetrator. I totally emailed her, but instead of reaming her and asking her to take it down, I told her that I thought it was cool that there was another provider nearby that had such a similar mindset to my own, and hey, maybe we should get together sometime at playgroup with the dck's. I felt like this would let her know that I noticed.

Months later, I met her IRL and we actually became friends. I never said anything to her in a negative way, and I'm glad I didn't because she turned out to be pretty cool, even if she did poach my intellectual property.