Due to Pre-XMas-Stress we nearly forgot to announce:

LGOGDownloader, the GOG-Downloader for Linux, is available now in Version 2.20 for Debian Wheezy from the Repository.

Changelog:

LGOGDownloader, the GOG-Downloader for Linux, is now available in Version 2.18 for Debian Wheezy from the Repository.

Changelog:

LGOGDownloader 2.18

For the Linux GOG Downloader there is now an (unofficial) Debian Wheezy and Jessie Repository.

Just add to your /etc/apt/sources.list the following Line (or create a new file in /etc/apt/sources.list.d with the following line):

deb http://mash-systeme.de/debian/ wheezy main (for the Debian 7 Wheezy packages)

OR

At last:
GOG now officially supports Linux!
Starting with 50 Titles, which are delivered for download as .DEB and .TAR.GZ.
These games use WINE or DOSBOX as Wrapper to run on Linux.
Officially supported are the Ubuntu and Mint Distributions in current and upcoming LTS-Versions.