Thanks for the tips. I’m thinking that’s what I may do — build a new site specifically for Yahoo and optimize the existing site for Google, since Google already seems to like it. I’ll add more unique content to the existing site, too; hopefully Yahoo will lift the penalty after I do this. I don’t know if it would be worth my time, though — many people on Webmaster World say that it can be very difficult to break free of the penalty. I guess it’s worth a shot.