My Macbook Pro's fans are running louder. I've also noticed that the average internal temperature is significantly higher. (187°F as I write this.) This didn't used to happen unless I was running full-screen video or recording multitrack audio. I've made no other changes to the computer that I can remember.
Recently, I turned on Spaces, and I thought that perhaps leaving these open was running the processor more heavily, creating more heat. But turning Spaces back off didn't help.
How can I see what background processes are running? Is there a way to track this down?