Jeff Nimoy has a fansite, and he is happy to answer questions, inluding those about Digimon: Data Squad. Go join, show your love, give your thanks! If you like the dub, let him know!
The fansite is through myspace; the voiceactors for Yoshino, Marcus/Masaru and Kristy/Chika (Colleen, Mellissa Fhan and Quinton Flynn respectively) also have myspace accounts, and i'm sure they would love to hear feedback.
Jeff, Colleen and Mellissa have also been appearing around http://the
digiport.com/ basicly to say hi. I don't know if or when they will be back, because a BIG arguement broke out there today, inlucding much bashing of Jeff Nimoy. But they may be back, and who knows, maybe other guests will come along eventually! Keep an eye out; they've only spoken through the comments on the newsboard, but maybe they'll show up on the forums eventually?
(remove the spaces in the links)