To set up danish hyphenation in LaTeX, first make sure you have installed the tetex-package. This package contains a configuration-utility called texconfig. Run this as root, and if it complains that config.ps does not exist, make sure you have installed the tetex-xdvi-package as well.
texconfig is a menu-driven (curses-based) configuration tool for TeX.
Now, select hyphenation → LaTeX. This will open an editor with the language configuration file. Edit the entries wanted (eg. make sure danish is not commented out by a % at the beginning of the line), and exit the editor. This will cause texconfig to compile the language hyphenation patterns. Exit texconfig.
In your document, select danish hyphenation by including this line in the document:
Linux
Electronics
Nostalgia
Code
Projects
Spiff
Links
\usepackage[danish]{babel}