OK, as promised some temperatures.
Load temps after 1 hour of Quake (demo loops), smallest window and screensize. 50MHz, A2000 case, no additional cooling (just the PSU fan). Measured with my good 'ol 3M Scotchtrak, at the warmest spot on the chip I could find. Ambient 19C.
Idle/Load
Rev 1: 55/62C
Rev 6: 51/57C
Roughly a 5C difference, IMHO not bad for 2 revisions of the same chip (the process shrink obviously helped).
Then I added an enzotech cnb-s1l + ceramique to the Rev 6, and measured again:
44/51C - A decent improvement, load was now where it idled without a heatsink! Ambient was also up a few degrees from the earlier tests. Temp might even come down a degree or so more after the paste breaks in.. :p
The above plus a small fan, and amazingly the load temperature drops to between 28 and 35C, depending on the amount of airflow (doesn't take much, an undervolted 40mm will do). On my Apollo 1260, load is always under 50C at 80MHz, in the desktop case, with the same copper cooler and a 40mm fan at 9v.