I just want to add that although the “twice indexed home page” rule is correct, when you click on “more pages” your site is banned only when your home page is indexed twice, and there are no other results.
Sometimes Yahoo shows the index page twice, along with other pages from the site, and then your site is not necessary banned. I dont know what it means, maybe upcomming penalty…I have a website which has this thing right now, but still ranks for some keywords, so I will wait till the udate is over and see the results.
But if only your home page is showing (once or twice, no difference), than you have a ban, brother. There is nothing you can do – just stop spamming and hope it will get back in the index in an year or so :shhh: :grunt: