Caritas Brazil issued an appeal a couple of weeks ago requesting contributions that can be made through several bank accounts in Brazil (contributions from out of the country would need to be wired to the banks, most likely): http://www.caritas.org/
Caritas International, based in the Vatican, issued an appeal today to raise US$1.1 million for Brazil flood victims. Contributions can be made online with any credit card (as well as by check or wire transfer). The press release describes the kind of relief intended.
The Caritas website says donations can be earmarked for a specific emergency, but the Brazil floods are not on the list of choices on the online donation form.
Contact: Michelle Hough Tel. 39-06-69879721, 39-334-2344136 or firstname.lastname@example.org
Currency converter (Euros to other currencies): http://www.oanda.com/convert/
Many thanks to Laurie Dougherty, in Massachusetts, for the information in this post.