With the risk of sounding stupid I really want my next laptop to be useable in my lap. Not ripping a DVD but for any other activity like web, watching a streaming movie, playing Age of Empires, Civ IV or coding. Am looking at Macbook, MBP 13 or 15 current generation. Another option is the 15 inch MBP last generation 2.53 with only Nvidia 9400 graphics and no discrete card. My two main criteria are: -Battery time, which I believe all of these offer decently -Heat (almost most important since I don't want to have anything I need to drag around to put underneath it in order to be able to use it without overheating or burning my lap. Already done that for my first gen MBP and subsequent MBA). Appreciate any info from owners of the above machines when it comes to Heat and battery time!!