<voice of reason>
I would refrain from any malicious acts on him personally, his business, or other interests. The MameDevs and the person (goes by the moniker "Chemical" I am told) who created the logo have the ball now. This issue will be settled with lawyers, not tomatoes.
While DF has, IMHO made an tactical error in his stated attempt to combat unfair trade practices in regards to multigame systems, I will give him the benefit of the doubt until this plays out.
I just don't like the idea of sabatoging a guy's interests without all the facts. I personally think email and letters to him stating your opinion as well as the other legal notices discussed here are reasonable. Hate-mail and other harassment are not IMHO.
</voice of reason>