I know some people in the past have moaned that GOG keys are not sold on HB, well guess what....

DUN - DUN - DAAAA!

They are now, only the Witcher games that I have seen - which by now everyone here owns at least once - but it is a positive sign that GOG are willing to try selling their keys elsewhere.
Links:
1 - https://www.humblebundle.com/store/p/thewitcher_storefront
2 - https://www.humblebundle.com/store/p/thewitcher2_storefront

The little gray icon that I thought at first was just a DRM-free label, is in fact GOGCOM.



- PS - I did look on Google if this had been posted before, but could not find anything.

Defender's Quest also comes with a gog key.
https://www.humblebundle.com/store/p/defendersquest_storefront

Yes and Defender's quest was on a Humble Weekly bundle for the minim donation. A pretty nice deal!

The Witcher 3 also have a GOG key

https://www.humblebundle.com/store/p/thewitcher3_wildhunt_storefront

People seem to forget, its up to the DEV not GOG as to whether gogkeys are offered in store or bundle X.

I wish they made that GOG graphic a little easier to distinguish from the DRM Free graphic. I also wish that GOG was searchable there. Even if there are only a few games with GOG keys so far, maybe it'll grow...