tedster - 7:58 am on May 3, 2010 (gmt 0)
In recent times, widely oscillating rankings can be a sign that the backlink profile is either getting stale, or is too narrow in its variety. By variety, I mean focused too heavily on blogs, or directories, or social media, or article syndication, or press releases, or reciprocals, or... fill in the blanks. I'd work on that angle for a while. A wider variety of honest backlinks certainly can't hurt.