For those of you that might not know, GOG Connect is a service that allows you to link together your GOG and Steam accounts, essentially giving you DRM-free copies for your Steam games. Naturally, this only works for a select few games, but it does appear that the list is going to continue expanding given that GOG recently added 17 more games to the service.
If you're interested in learning more about GOG Connect I would recommend you head towards the official FAQ, it should cover pretty much any question you have. On the other hand, if you're just looking to find out which games have been added, here's the full list:
• A.I. War : Fleet Command
• Anno 1404
• Baldur's Gate: EE
• Cossacks Anthology
• Dex
• Hot Tin Roof:the cat that wore a fedora
• Hotline Miami
• Incredible adventures of Van Helsing: Final Cut
• Olliolli
• Shadow Warrior 2013
• TeslaGrad
• The Last Federation
• The Master Plan
• Two Worlds Epic Edition
• X Rebirth
• X: Gold
• Ziggurat
On a somewhat unrelated note, GOG is currently having a "Back to School" sale, so give it a look if you're searching for some more games to play. My personal recommendation would be to go with Dragon Age: Origins - Ultimate Edition (-60%), or with Pillars of Eternity (-60%), though I am obviously biased towards old school RPGs.