So I bought my MacBook, a black week 21, last Saturday (7/1) from the Apple Store. I've kept an eye on CoreDuoTemp (in the menubar) since I got the machine, and with the machine 'stock' I never saw temperatures stabilize below 63°C. When the machine was being lightly used (with Safari or iTunes, for example), the temperature would stay around 66 to 70 or so, and idle temperatures never dropped below 63. Using the disassembly guide from iFixit, I took the machine apart a few days ago and reapplied AS5 on the processor and chipset. Needless to say, I'm glad I did. 30 minutes after a cold boot, the machine idles around 51-56°C, and during light use it stays around 54-61. Under heavy load (2x yes>/dev/null) it still gets up to 81 or 82, but the fans kick up to full speed right away and keep the temperature in the 70's. I let the yes>/dev/null windows churn away for 5 minutes, and after closing them the temperature dropped back to 55 or so in about 10 seconds. Lastly, the area of the underside of the case near the magsafe and the top-left edge of the keyboard still get rather warm, but it takes considerably longer (like a few hours of constant DVD ripping) for those areas to get as hot as they would previously get while browsing the web. I know there's already a thread similar to this one about the Pro's, but I thought I'd start one just for MacBooks to see what kind of results others have been getting, and for anyone else considering doing this.