I was just looking at heat sink reviews and realized the heat issue is not gonna ever get better unless something different is done. Even with the shrinking of the manufacturing processes, heat output is still climbing as chips get faster. So, here's my suggestion: Create a new form factor that mounts the CPU (and any other heat producing devices) directly to the computer case. Then, the case (or at least that side) could be made from a thicker aluminum/copper. Tada! back to passive cooling! You could even use small fins if you want, esp near the CPU core mounting area. You'd even be able to use this as a room heater.