Hi Joel,
Brilliant article and great advice for anyone coming to Paraguay. Unfortunately you neglect to stress the importance of opening a bank account in some international bank (such as HSBC, Citibank or the like) in your home country that also operates in Paraguay or any other South American country, well in advance of leaving home. This facilitates the ATM transactions. I know that here in Brazil you can't make international transactions in just any old ATM. At least with the international banks mentioned you can use all of their ATMs and most of their networked ATMs too.
Also while it is perfect advice for Paraguay it may not be quite so easy in other countries to wire transfer funds, for example here in Brazil not only must one be concerned about the current exchange rate, but also the Central Bank's regulations about international transactions and taxes imposed by Brazil on financial transactions. So while you may not pay income taxes, per se, you can't get away from the tax man completely.
Keep up the great work!
Cheers,
William James Woodward - Brazil Animator, Expat-blog Team