Nose diving CPM rates

[billuk]

Has anyone else noticed a nose dive in CPM rates from Monday 30th March onwards?
I had hoped the start of the new month would show a recovery but sadly not.
My site is primarily targeted at UK visitor, visitor figures aren't notably down, nor are clicks.

[HuskyPup]

Have a look at the complaints here:

[webmasterworld.com...]

[jetteroheller]

My main symptoms

Lower impresssions - German area has just the first days with sunny warm weather after a very long winter

Lower CTR

Higher EPC

This is for me an indicator that the bottom line is reached.

This means that the auction system of AdWords / AdSense reacts on the lower supply with clicks with a higher EPC.

[signor_john]

I've seen an increase in eCPM for April, compared to March, but with 28 days left in the month, I'll wait to buy the Champagne. :-)

[jetteroheller]

Do give it numbers

Compared to the average from June 5th 2004 to now
the EPC is

2008-Dec 102%
2009-Jan 86%
2009-Feb 79%
2009-Mar 88%
2009-Apr 98%

Only CTR is a disaster (compared to average sinc June 5th 2004)

2008-Dec 63%
2009-Jan 57%
2009-Feb 47%
2009-Mar 43%
2009-Apr 33%