EPC is way up for me as well. It's just over a three fold increase.
For me, this increase started on 11/25/2005 (late Thursday and Friday).
Also, click through rates are down under 1% (about half) and ad relevancy 'on average' is down as well.
That being said over the last 3-4 days I am earning more than ever. For the first day I thought it was an error and would be adjusted. But so far this trend is continuing.
I run a regional travel site. I am still getting some ads for this region but also off target or general travel ads as well. I assume, at least, for the moment that these general ads have a higher CPC/bid which is generating these fantastic EPC's. Maybe Yahoo is taking a broader look at the keywords on my page instead of looking at the more regionally focused nature of each page.
This is great for the moment but I have a suspicion that these fairly high EPC are going to go back down as ad relevancy increases...?
I saw the same thing, or basically the same thing - non-targeted ads that had great EPC but generated fewer clicks. The simple fact of the matter is that the RON ads paid higher than ads from my own niche. I blocked them anyway, shooting for relevancy and an increased click rate as opposed to the higher paying fewer clicks. It's only been a week but CTR has doubled while EPC has decreased by only about 30%. Blocking those ads (non-relevant and RON both) was absolutely a smart move, at least for me. Again, it's only been a week but the numbers have been consistent each day.