So here's a short list with some of the best looking Brazilian Drupal sites I've been to.

• Movimento Nossa São Paulo
• Portal UNOESC - Universidade do Oeste de Santa Catarina
• Canal do Produtor - Portal de informações sobre agriculta - SENAR / CNA
• Escalada Café: Notícias, Comércio Virtual e Rede Social
• Surf Brazil
• CEFE.NET
• Pier de Ipanema
• Comunidade Bíblica de Curitba
• Carvalhar.com

I'll keep updating this list as more pretty sites show up. If I missed any site feel free to post it in the comments.

You can also find more websites at the Sites Showcase at the Brazilian Drupal Community in the forums http://drupal-br.org/forum/geral/galeria-de-sites