mlxwizard - 5:54 pm on May 3, 2007 (gmt 0)

mmiller:

The drop off could be for other reasons.
Check your stats from last year and compare to this year.
Depending upon your niche, you may be seeing a seasonal decline. I also would check the search trends using trends.google.com
I have noticed a decline since 2004 of many previously hot keyword search volumes for my niche.

It's not always the search engines that are to blame for traffic declines, or increases for that matter.
Current events and weather seem to play their part too.