CommentCast is a Mac app for displaying iTunes and App Store reviews (via Daniel Jalkut). This is better than viewing the reviews in iTunes or the Mac App Store because you can select/copy/paste the text, it shows reviews for all the international stores, it makes it easy to see when there are new reviews for your products, and it can translate foreign reviews.
Another option is to go to the Customer Reviews page in iTunes Connect. This offers an RSS feed for each product and store combination. However, feeds are only available for the stores from which you’ve already received reviews. I suppose that you could guess at what the feed URLs would be for the other stores, but you’d still have to keep them updated as new stores become available.