tcsoftware - 12:52 pm on Oct 31, 2011 (gmt 0)
Yes in the past week I've seen something similar.
One of our own product pages appeared to start to compete with the homepage in the rankings.
The homepage is generally found for keywords instead of the product page and searching by the product name shows the product page at position 2 with a non-authority, non related website at position 1.
It's only happened in the last week and we've not made any changes to the site in months.