Guys, I am not as good in english as u native from Us. But I like to share my almost first profesional experience with my 7D (regard all those issues you mention in this post)
I'm creative director and director of a prodution house.

I happeng to shoot a developing drawing with an artist on a sand board for a Bank tv commercial. 20" 5 spots to be exact. We puted the camera cenital with a live monitoring Hd Ikan and spliter to YUV componet for client.

Here is the deal:

The drawing took 15 minutes to get it's best result. grabbing sand with fingers, pouring it to diferent areas of the (1.2mts x 80cm). The camera shoot 12 mins on a 16GB CF and just get turn off the rec system. We changed to a second 16GB CF, and let the camera document the growing picture. The camera at this point went well with the consecutive 12 mins. And Again I change the CF previus to pass the material to my computer. In the next 12 minutes, I got scared when Heating Warning appear around 5 minutes of recording. The drawing wasn't finish, so I decided to go on with the recording pushing with faith on my 7D, the warning was disturbing becouse the client was watching the same signal on the other room. Finally the camera at 10 minutes went off. For good.....After 5, 8, 10 minutes I tryed everything to reanimate the dead 7D...was unsuscessfull. I though the worst: The camera vanished. Again, I tryed at 15 minutes and it wake up....I decided was time to get back in business. But the warning show up 3 minutes later, I turn it off at least every 3 minutes for at least 1 min of rest. and again no more than 6 minutes of this, the camera died again. So in this horrible situacion with the client wondering our delay....I decide to call a rental house and get me a RED ONE cos there was'nt nothing more at that moment ( an EX1 or 3 for examp) . This camera the RED ONE, I have to say , it's no my favorite cos the slow process to work with and the weight. After expend 1 hour attaching to a barracuda with all the security measures for a simple cenital shoot, (7d took just minutes) . We shoot.. but , for my sorprise, it wasn't better compare with the 7D shots. No to mention the tendency to magenta color (you can fix with a IR). The 7D achived a texture in the sand that red had to fight to be the same, RED looks more plain without all the post saturation, gamma, black levels etc etc etc. 7D went just as it record it.

I have admit, it was to much to ask to a 7D shoot consecutive 12 minutes x 3. without put in risk the overheating. So I know I'm going to use it just for simple 1 minute o 3 maximun shots for a tradicional commercial. Just like Phillip Bloom (IoI). I have to say It worth the image result. its very good for my humble opinion but never going to try this extreme situasion with a client on my shoulder.

However I wondering if this all double monitoring was part of the overheating, cos when we change to the RED , I optimized the wasted time setting the 7D as second Camera, for the close shoots in tripod and Without the second monitor, jut the IKAn for our work. And I shoot at least max 5 minutes, turning off the 7D when completed a escene as we need it. And turn it on again for the next. Well....never show us the warning again on a 3 hours job. That make me suspicious and I going to test this again to see if the added equiment have to be resposable in part of this constant overheating.

I got the shots I got the commercials finished And I want to share some of this when the spots have been on air later next April.

thx all of you

sorry again this crap English.

My T2i had the heat indicator come on at my shoot yesterday. It was after about 90 minutes of on/off shooting. Nothing really long though. I finished what I was doing and shut the camera down for about 5 minutes and it ran the rest of the day with no issues. as it was my b-cam, it didn't bother me but had it been the primary, I would have been sweating bullets. Sorry to hear of your troubles!

Next time try one of these 38 WATT PELTIER MODULE-MPJA, Inc. (http://www.mpja.com/prodinfo.asp?number=12323+PM),
stick to the back or on the bottom of your camera, I will try it for a long shoot next time, but I shot an event last week, 5 consecutive 12 minutes then 1hr. rest then another 4 consecutive 12 minutes almost fill up 2x 32 gig card and my 7D dit not overheat, but my T2i did after about 1hr. 20 minutes I think, I thought if anything my 7D would overheat first because of the 2 processors instead of 1 on the T2i.

Evans Briceño , Did you mention anywhere in there what Temperatures you were in?
were there hot lights on the set? was the sun hitting it? INFO seems like you left out the most important information?

(if my video camera did that to me during any job, It would be walking home, assuming it could get itself out of the dumpster :-)