A simple, yet sufficient Photo Gallery that ships with BLOG:CMS, based on http://singapore.sourceforge.net/. To install it, just upload all files in /photo/ directory and set permissions (chmod 777) on these dirs:

/photo/data/
/photo/data/cache/
/photo/data/logs/
/photo/data/logs/views..log
/photo/galleries/

Admin area:

• Default username: admin
• Default password: password

To upload images, you can do this via Admin Area, or simply upload images into /photo/data/your-directory-name, Singapore Photo Gallery will automatically recognize these, and create thumbnails for them.

Also, make sure your directory names are descriptive.