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You can also include one key word of your site in front of all those variables and one in the end. Like "keyword - variable - variable - another keyword".
Xcgal for me is excellent BUT, the main problem of the module is the way it shows the pictures. Before the alt text you can see that it only shows watermark.php (if you are using watermarking) for each picture and if you try to save it in mozilla, it will be saved as watermark.php where as if you try the same in ie it will be saved as watermark.php.jpg.
I think it is essential to show the type of the picture and the path where it is stored so that google will not see this as duplicate data too.
And one more idea is to show toolbars or resize the picture in case its too big to show when, open in full size (new window).
Apart from those details for usability and SEO xcgal rocks
I also did one hack to edit the details of the picture you are viewing only so that you wont have to edit all of the album images to edit just one. Its not perfect but its working...i can send it to you if you are interested. perhaps you can make it even better
Cheers