When it became looking grim for the SG KS project somewhere around the third week, I hit all the (few) forums where I was registered and there were various people who were very intrigued and thankful to find out about that project. Few already knew. Overclock.net is usually a very quick site and is the only site where I am registered that had a thread about this project already, with many responds. Three sites were Thief forums (ttlg, darkmod, official Thief 4 forum). Legend of Grimrock was another. Even a fan site for the Star Citizen game had some backers.
Myself I found out about SG after someone mentioned it on an indie game forum.
Interesting is, that the feedback on SG on all these forums was as good as 100% positive. This, combined with the effort of other community members and the TotalBiscuit tweets surely brought some nice results. I could definitely see some gain in pledges, but the thing toward the end was magic... scuse me, thaumaturgy.