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Sorry for my confusion - I have trouble wrapping my head around your question. Let me make sure I understand correctly Through domain mapping, these 180 URLs redirect to www.meusite.com, via a 301 redirect? And each url ranks for a particular set of keywords and you've seen fluctuation for these individual urls? Without over-thinking, it seems highly likely that Google would treat these URLs suspiciously - especially if the content of the landing page changed dynamically. In fact, I'm having a hard time understanding why Google would even rank those pages at all if they 301 redirect. Let me know if I have the facts wrong and I'll try to weigh in with more information.

Nofollow links usually don't contribute to your ranking, although getting a few links from wikipedia certainly helps. The thing about nofollow links is that they belong to a "natural" linkprofile. If all your links are followed and from very good sources, google might consider these links unatural (aka. bought). if all your links are nofollowed this might be considered spammy (not for new websites, though). So get a natural mix of followed and nofollowed links. Also get some pages with you websites URL but not as link, just as text. Best thing would be to analyze the linkprofile of the sites in your industrie, erspectively your keywords. You will probably find a low percentage (5-25%) nofollowed. This would be a good target ratio to begin with. A new website usually starts very slow in link growth and usually starts with a higher percentage of nofollowed ones. EDIT: Best source for natural nofollowed links are blogs / comments in your industriy

Hi! You're seeing something that Google rolled out last month where they put in lists like that in the SERPs. They wrote a post about it at http://insidesearch.blogspot.com/2011/08/new-snippets-for-list-pages.html.

Eu usaria .com.br, porque as pessoas tendem a digitar o dominio algumas vezes direto na URL e essas pessoas tentar por .com.br. Eu tambem pensaria em outro dominio mais curto, pela minha experiencia dominio grande tende a ser dificil de gravar na cabeca do ser humano. Eu usaria .com.br , ate porque o dominio esta em portugues entao ngm fora do brasil buscara por isso. Faz sentido?