It really is too bad Jorge that you will not take a more active role in Bitcoins and that you discourage your fellow Brazillians from doing so. Bitcoin would be very useful in Brazil for visitors and Campinas is the perfect spot to start it due to its tech infrastructure.
I have traveled to Campinas several times over the last 2 years consulting with CPqD and co-located spinoffs and I'll report that I spent a significant amount of my free time acquiring, managing and worrying about money. The problem is I could find only one ATM that would dispense cash (HSBC) although most of them theoretically were compatible with my card. And wandering around a foreign country punching your PIN into every available machine has got to be a pretty dumb idea...

To make things worse, the one HSBC ATM that worked would only dispense about $100 USD per 24 hours. Now, Brazil is not cheap. The hotel is > $100 per night so using cash only is impossible. But even using it for daily expenses was hard. The cab ride to and from CPqD was about 20 bucks each way, leaving 60 bucks for food spread over 3 meals. So $20 a meal is certainly doable, but not at a nice restaurant with beer, or allowing me to pay for others. Also, I wanted to visit the ocean (6 hour drive) -- luckily I found a HSBC in Ubatuba, or I'd still be there :-). And at the end of the trip I needed $150 for the cab ride BACK to the airport so I had to actually build that amount up via withdrawals over several days by eating dinner at the hotel.
Credit card fraud (double swipes, etc) is pretty high so I was told not to use my CC at every random store. Also, Brazil has a couple of CC networks and the only one that worked for me was "Cielo". But the "Cielo" reader was this handheld "mobile" device that sometimes would fail due to network connection or something... I had to pay one night hotel in cash. Its nerve-wracking to be in a foreign country unable to speak Portuguese and wondering if your CC will work for gas already pumped or a meal already eaten. Cash is king in these situations.
If there was a local Bitcoin exchanger it would have been easy. I could have carried BTC in and exchanged it for a couple days of spending money.





