Here's the numbers for one of them in the last month:
* google (organic) 5,552 73.52%
* yahoo (organic) 872 11.55%
* (direct) ((none)) 618 8.09%
* bing (organic) 200 2.65%
These are 3 different metrics. You can't extrapolate backwards from a website's referrers to gain knowledge of the first two metrics.
It's easily explained by either searchers having to do more searches on Bing to find a page they want to click, or Bing presenting more information within their own site so that the searcher doesn't have to click away. If either of those rates is higher than Google, then Bing can have higher search share than it will have referral share among other websites.
On what is a non tech site (although the audience probably skews somewhat in that direction). But as has been mentioned, one site is not the whole internet.