There should be warning messages: I tried to follow the "Putting Flickr on Rails" screencast from Rubyonrails.org but my application didn't work. It turns out the tutorial is outdated and the flickr gem has been replaced by rflickr.

See:
http://blog.couloir.org/past/2007/1/28/flickr_off_rails/
http://www.maxdunn.com/RoR+and+Flickr

So far I'm up to 'generating a Flickr Token,' portion of the Max Dunn tutorial. I am getting errors on the 'f.auth.getFrob' step. So there is more investigating to be done and I will try this again later.

EXIF camera data

Reading the data saved in digital photographs by digital cameras

EXIF (Exchangeable Image File Format) data. This is the data that digital cameras place in their images, such as the date and time, shutter speed, ISO value and so on. The EXIF
functions only work if EXIF extension is enabled on your server. If they are not enabled and you or your host decide not to enable them, there are several programs that will read EXIf data without using the EXIF extension.

The Image Creation Capabilities of PHP

PHP image functions will allow you to create images dynamically

"The format of images you are able to manipulate depend on the version of GD you install, and any other libraries GD might need to access those image formats. Versions of GD older than gd-1.6 support gif format images, and do not support png, where versions greater than gd-1.6 support png, not gif." -- From the PHP Manual: Image Functions

PHP Slideshow using a text based database

What is a slideshow?

At its most basic, it is a sequence of images. You can create this sequence in a number of ways.

Example of a basic simple sequence:
There is a starting page, a separate page for every slide in the show, and a finishing page to return the viewer to wherever you want them to go, usually the starting page.