Look past to the right and you'll find an excellent *cough* selection for you to download or peruse or whatever you're going to do with them. I should say that you should download the manga to see if you like it, then go out and buy the real thing to support the mangaka.
Now if you're downloading a licensed manga, you must delete it after 24 hours, whether you decide to buy it or not. This is meant to be a "trial." Of course you may end up reading the whole thing by the end of the day, but I guess who's to stop people from reading manga in the bookstore? Heh. By downloading the manga, you save everyone else from the clutter and congestion in the graphic novel aisle at your local bookstore.