Three years ago I wrote a couple of article about how an images in a NextGen Gallery could be linked to a post or a page using the NextGen Custom Fields plugin. And last week I provided instructions about how moving the NextGen files that you have modified to your theme directory would allow you to upgrade NextGen Gallery without losing any of your customizations.
Recently, I was asked to link images in a NextGen album to a post or page. An album is a collection of galleries. As the instructions are slightly different, I decided to add another NextGen Gallery tutorial.