Most high-profile Kickstarter projects raise 20 % or more of their total pledges in the last 48 hours. If you check the pledge total trendline on Kicktraq , you'll see that it aligns pretty close with that number.
I disagree with a previous commenter. They've delivered enough proof as far as their ability to deliver. The problem is their "old" pitch was targeted towards developers & there is just not enough of these on Kickstarter to raise 750k, only yesterday did they fine-tune their selling points & replaced the project video with one that's more likely to resonate with mainstream users (Ubuntu, media center, a Rapsberry Pi on roids etc..)
I wish them nothing but the best.