I Just Went From PR3 to PR0 ...

The site is 10 years old.

I still have first page position on most of my keywords. Increase of position on some, decrease in a couple. I have been actively bringing in backlinks via White Hat the last 2 months.

I have checked and page maintained at PRO over the last week. Other pages on site have PR1 to PR3. It is 6 page html site with little change; but I do have a blog attached that is updated 1-2 times per week.

Any cause for worry about page position in the future?

Thanks.

It's a cause for concern if you don't know they the PR dropped from 3 to 0. If you do know and are fine with it then it could be okay. There are many ways of sculpting the PR on your site. You can pass the PR back and forth between pages by linking them together. Have more internal and external links coming into the pages you want to favor. Make all of the links going to external sites nofollow to stop your PR from leaking out.

I could care less about PR as long as it doesn't affect Google page rankings.

I have had almost 50% more traffic in the last month. Links growing. Making more money than I did this time last year (Brick and mortar business). Just want to make sure I head any trouble off at the pass.

Thanks.

PR is over-rated but it's still a factor in the calculation of search results so it does affect the rankings. There are really two PRs, Google's internal PR and the toolbar PR. Internal PR is what Google uses and toolbar PR is what people see. Google calculates the internal PR continually but it doesn't want anyone to know how so it shows the toolbar PR as a substitute. Toolbar PR is updated only about 4 times a year and it's out of date by the time Google shows it so it's not as important for search results. Use Google Webmaster Tools to look at your PR because it's closer to the internal PR. If your internal PR drops then it could signal a drop in the search rankings unless other factors like keyword relevance improve.