There`s one of possible solutions that works on my laptop - do not install iTunes with Leopard. Use Lawless relase without it. I don`t have this problem anymore, but first time when i installed iTunes - problem came back, CPU was heating like hell etc. just after installing iTunes, i didn`t even have to run it. So - for me, maybe for someone else as well - no itunes = no problem. I hope i won`t install another program like that.