When I created this widget, which automatically generates an image gallery from a given path, I was thinking about a possible integration with Wordpress because the public method GalleryWidget::outputGallery() returns a string representation of the HTML contents of the gallery. It's a small, lightweight class that you can also include in your template system with a minimum effort. It uses regular expressions to match all the most popular image extensions, including JPEG, GIF and PNG. Anyway, if anyone knows a way to include it in Wordpress, please let me know. In the meantime, feel free to test it and suggest every possible improvement.