Ah, according to the info at comicunity FFView is a good reader for Macs. (You can also, I think, view .cbr files as individual jpeg images if you change the extension to .rar and unzip it, but I recommend using readers as it makes it much simpler.) But I LOVE downloading runs of comics and devouring them... paper copies are better, yes, and I spend more time relishing the art, but for giant runs of stuff, I love just reading them on my computer. (I can totally provide recs, if you want. Just let me know what you're into!)