Blizzard has admitted that its latest Starcraft II game has a bug which can cause a GPU to go into meltdown.
The game's menu screens aren't framerate-limited which means that if the computer has nothing else to do the graphics hardware gets bored and starts to render the screens. This sounds like a good thing but actually causes overheating problems for the card.
The good news is that it is a doodle to fix. If you go into "Documents\StarCraft II Beta\variables.txt" "Documents\StarCraft II\variables.txt" file and add in the lines frameratecapglue=30 and frameratecap=60 everything goes much better.
It is strange that while Blizzard have admitted that there is a problem, it has not really notified people about it. Still it is nice to have a fix and if your GPU has not melted down to China you can probably give it a go.