Different Adsense slots for different forums / sub-forums?


Formerly CyclingTribe
I've always used a single global ad-slot for each ad position across the whole site, but with custom channels in Adsense it is possible to create a number of ads for specific areas of your forums and (presumably) use template IF conditions to show certain ad slots to certain node IDs?

Just wondered if anyone is targetting this specifically and whether it increased bids on your ads, had no impact, or lead to lower earnings?