GRSlideShow is the perfect solution for the lazy Web master that wants to have some pictures online.
Your visitors will see your pictures quickly and easily, and can even print T Shirts with the picture they see in just one click. Each directory of your pictures is an album. Put the script in the parent directory, and you're done. Call the script with ?admin=1 to see the admin view with many options.
It supports Web or FTP upload, zip extraction, smart caching, and a lot more.