Do You Need Fresh Content to Maintain Rankings?
This is a contentious issue. Do you need to add new content to your site to keep your rankings from sliding? My experience has been “no”. Just do a Google search on the phrase NJ tutors and see where my wife’s web site, www.APlusTutor.net shows up. That site hasn’t had new content added in about 8 years.
With that said, a very good argument can be made that adding new content (not changing existing content) can give you new opportunities to use and be ranked for additional search phrases. And one excellent approach to that is to have a blog. (Like the one you’re reading now.)
However, there are as many opinions on the subject as there are web site owners, it seems. For a good selection of prevailing views and opinion see this forum thread at Web Pro World.