Hey folks. I'm currently about to switch over from a 12" iBook to a 12" PB. And i'm a bit concerned about all the heat complaints I'm hearing from PB owners. I keep hearing different things. Some people say the heat is enough to burn, or its pretty cool, or more memory helps, etc. Can anyone clarify any of this for me? Is a PB significantly hotter than an ibook? Is it okay to use on a bed (with the vents kept clear of course)?