injpnThis is the easiest plugin to use for a gallery. Just upload the files in a folder and the rest is, well do nothing but put links to the gallery in the post.
However, the size of the thumbs are destroyed by the modified code. The original lets you display the thumbs as we wish but this modified version for wordpress resizes the file to a square, making an ugly mess of the presentation. If this is fixed, this could be one of the popular plugins for WordPress
