There seems to be a lot of confusion lately regarding the laws for employment of foreigners. There have been several changes since I moved here in 2005, namely the establishment of a quota system for full-time foreign employees, and a limit of 90 days per year on contracts for short-term foreign consultants.
Below are links to the law, both in Portuguese and in English. I suggest that any of you concerned about how your employment may be affected by these changes read the law for yourself, as I've received (and heard of others receiving) incorrect advice from HR departments and even company directors.
Portuguese version of Law on Employment of Foreigners
English version of Law on Employment of Foreigners