i think by 72px he meant 72 pixels per inch. that is what your supposed to do oak, browsers won't display anything above that. Here's a couple of other tips:
- Use GIFs and JPEGs correctly - GIFs are for things with text and limited colors, JPEgs are for pictures
- use seperate images if a mixture of image types would work better - a picture with a caption in the image is better off a JPEG for the picture and a GIF for the text.
- cut up images and piece them together with CSS if necessary
- use CSS for any large areas of whitespace - /img/capoeira-canal.jpg you can delete all the whitespace and use CSS instead. actually, it would probably be best to cut that up into multiple images...
Not sure if thats what you wanted, but.....