A word of caution. When travelling in Brazil, it is highly advised to NOT get out large sums of money as there is every chance you may get robbed, being that you are a not a local.
Really? OK then I will stop doing this. What's the maximum you recommend I should with draw at any point given that people are watching and following me all the time? Fifty reais? Twenty? Ten? I must say it must feel a little special, a bit like a celebrity, to know that you are being stalked at every waking moment.
Should I store the money in my shoe as your blog suggests? I can see my cash getting a bit malodorous but fortunately I spend much of my time just wearing havaianas.....oh hang on that might not work. Was that another piece of advice from your Brazilian friends? Presumably they told you all this in English cos I get the impression from said blog that your language skills aren't that high and after all "Brazilians just love the sound of English".
Brazilians also have well developed senses of humour, some of which you've clearly replicated in your blog. ;-)
@ The OP. In all seriousness there's probably no need to take out large amounts of cash. I say this from the point of practicality not security. Most places where you are going to make a substantial purchase will usually accept debit or credit cards. For pocket money, I see no reason not to take out the maximum you can and then store what you don't need for that day back in your accommodation. Otherwise you will be getting hit with multiple fees.
Experience suggests to me that the prospect of having your card cloned by a chupa-cabra device is far more likely than being mugged. I've experienced it, so has my wife and both from ATMs located in a bank. That said, even that's not a common experience. It does pay to keep your ATM receipts however.
Brazil has and at the same time hasn't changed that much in the past decade, so don't panic.