The 360 had the same overheating issues so it's not surprising that some of the PS3s are having the same issue too. When you cram in high end processors, video cards, etc. you get one hot running console. There are bound to be more failures than last gen.
I might get a PS3 once actual good games are out. I figure you can only replay Resistance so many times before you get sick of it. I think it is sad that there are plenty of PS3's instock while the Wii keeps selling out all over the place. This time last year the 360 was still selling out. Sony really had a bad launch.