I do mostly office-related work for a local branch of the São Paulo State Prosecutors' Office. It's located in a really poor town, so most of the time I'll be hearing people confess or denounce the sorts of crimes you won't find in any Law & Order episode.
I do earn relatively well (especially compared to other 20-somethings college dropouts), about R$4100 before tax, R$3500 after discounts (US$1770, £1130), a third of which goes to the rent, and another third to pay the loan I got at the bank to buy an used car. The rest's used to pay house expenses, US$ 80 for the cable, US$ 100 for the phone + ADSL bill, about $150 in food.