My earning for Feburary were down quite a bit. I only earned $710 US$ for the month.

I believe the cause to be that one of my major revenue generating sites has done something to offend the almighty google, the end result being that instead of Google giving my about 70% of the total traffic to the site, Google only accounted for around 1% of my total traffic for that site.

I have taken steps to fix the problem, so with any luck within a month earnings will return to normal.