I just left Circuit City a week or two ago after starting around Christmas last year.
When you apply for a job at circuit city you take two big long tests. They ask the same questions over and over about integrity and how well you are at influencing other people. The people who "pass" the tests become salespeople regardless of their past experience. CC will provide all the training that you "need" to sell stuff.
People who work in aud/vid, SOHO, and 12-volt DO work off commission. Here's an example: my friend's dad bought an HP P4 for like $2k. The guy who sold it to him made like $7 off of that. The reason the salespeople push warranties so hard is that selling the $400 plan nets the person like $30 or so depending on the item.
Circuit City just started this new thing over the past year called ACE. It's the area that has a whole bunch of junk like video games, computer peripherals, phones, boomboxes and portable CD players. ACE also includes the music department.. Training for ACE employees talked about phones, portable CD players, and boomboxes. There was nothing in the training (boring videos and "c-learning"

about computers, even though the department has the CD-writers, blank media, UPS's, hard drives, video cards, etc. I left making like $6.50 in the ACE department.
In the SOHO department, there were probably 2 people who knew something about computers. They actually put together their own boxes. Sometimes when they had problems the salespeople would come to me (little as I knew) for computer help.. in fact the number one seller asked me questions all the time.
It's kind of messed up to see the salespeople in action. One guy had like fifty relatives and friends who recommended this or that brand of drive or phone..
On the whole I think most people there did NOT like working there. They were either in school or just had a lot of friends there. Most everyone I knew was talking about leaving for one reason or another. The store that I was working at is currently trying to reduce its workforce (I'm guessing because of that 82% profit hit they reported). The weird thing is that they're replacing a lot of those people with new hires.
As a side note, Belkin and Monster cables are all unbelievably marked up for consumers. At "cost" (prices that employees get stuff at) a $20 USB cable cost me like $2. $10 crossover cable costs $2. Same goes for audio stuff..