Hi,

I have also experienced a drop in page rank (google.com.au) for my main search term 'business for sale'. I have been in the #4 position for over 12 months, sometimes getting to number 3, but for the last week or so I have been doing the google dance and dropping to as low as number 8 or 9.

I was also on page 1 in google.com for the same term, but dropped a full page and I am now on the bottom of page 2.

I seriously don't think it is because there has been no updates of your site over the past 5 weeks, but maybe google is updating its algorithm.

My advice is to not panick and don't change anything on your site. You will more than likely go back to the same position you were.

Cheers

watto