The NextGEN Gallery plugin can convert your WordPress blog to a full-fledged Image Gallery in just a few steps. This one is really good and has a lot of options and features to make you gallery even more powerful.
An interesting feature is that you can easily add watermark image or text to your images. It’s always a good idea to have a little watermark or text that displays your website address on the picture. No matter where someone sees your picture on the web, he or she will know where it originated from.
NextGEN Gallery also easily allows you to add effects when displaying the image. You may even make a slideshow of your best pictures and showcase it on the gallery. Overall, it’s a very cool WordPress plugin if you are going to upload a lot of images/pictures/photos on your blog.