Learning Portuguese for Spanish Speakers

Here is a great page for converting Spanish to Portuguese: http://alfarrabio.di.uminho.pt/spl/rules.html

I have also found reading in Portuguese to be be very easy, since I already know Spanish. I came across a very old book at the library entitled An Invitation To Portuguese, by Margarita Madrigal. This book was extremely easy to read, and also very helpful. It had themed chapters that taught you vocabulary words that were easily recognizable either by the context and/or from knowing Spanish. It also included grammar help and a short story at the end of the book. If you know other romance languages and you want to learn another language in that family, finding a book of this type will be very helpful, since you'll be able to understand a lot from the beginning, and eventually understand the patterns of the language.