The new feature allows you to connect your Steam library to your gog.com account (only one account linking allowed) and eligible Steam games are added for free to your GOG library. Pretty neat eh?
While I don't personally play much on GOG, this is an excellent way to expand or transfer your library to play it offline or DRM free for those of you who are less than fond of Steam. I was able to "connect" six games to gog, including FTL, Braid, Shadowrun Returns and The Witcher.
The games added will be permanent, but the games themselves will vary in rotation over time according to publisher deals and agreements. Also to note is that the "connections" are limited-time offers, so be sure to link up while you can.
Anyone enjoy GOG more than Steam?