Hey I think my macbook is running rather hot lately as I have the fan set at 6200(max) and it seems to idle at 50C and I had skype running with a few people and it was reaching 80C! It never used to get that high before! It is a Dec31st 06 (lol 1 day from 07) model and I do have the ability to open these models and apply the thermal paste again as I have done plenty times before and also fit Mac Pro serviceable options such as BT and AP
I know how to open it and clean it but theres no dust in it to make it that hot
I might have to try max load and see if it overheats 
I know how to open it and clean it but theres no dust in it to make it that hot