I have a Gateway 2614u. I have found that getting it up off of a table or desk will keep it cool enough to run it for a slightly longer time without it over heating.
Personally I see it as a design flaw personally, at least on the larger laptops. I had a HP that was a 14 inch and I could run it and run it and run it and it rarely got too hot. My 17 inch Gateway I can run it for a few hours, and I have to give it a break or it shuts down.
I believe the flaw is in the design of the battery and where it is located. HP batteries sit farther away from the processor where the GATEWAY/ACER sits closer to the processor and close to the fan making the heat less likely to be blown out.
I got this laptop about 1 year and a half ago, and I am going to have to replace it already....I don't believe I will be buying another Gateway any time soon.