The yellow ones on the left look like Devil's tongue - the name says it all - my plants are producing mostly red ones but a few yellow showed up.
The middle ones look like my scorpion Butch T.
The one on the right - no idea - sorry.
Lori

Assuming Cross Country Nursery is not completely wrong in their plant offerings:

The middle ones would be Moruga Scorpion
The right ones would be 7 pot douglah

The ones on the left were labeled Bhut Jolokia... but why are they yellow!?

Well, I emailed CCN and they explained that these are ghost peppers.
Here is their explanation, they also gave me a credit for 1 plant:
We began offering Bhut Jolokia in 2007, from seed purchased at New Mexico State University, well know pepper breeders. In 2008 we again bought seed from NMSU. That summer we received a few calls about a yellow pod. We thought that maybe we had made a labeling mistake here. But then we spoke with another grower, who had bought seeds from NMSU in 2008, and had a few yellow pods showing in his field as well. Long story short, Bhut Jolokia Yellow was born. I am told that these are interspecific hybrids that will crop up from time to time, which can vary the podsâ shape, size and color. We have been working over the years to clean up the Bhut Jolokia line, as well as the Bhut Jolokia Yellow line (sometimes some reds in the yellows). It is a long process, and we may never clean it up completely - the Habanero Chocolate will occasionally throw red pods, due to brown being a recessive gene and red being dominant. Some things in genetics just cannot be controlled. But we are trying our best.