It seems like ever since the announcement of the Adwords test, something isn't quite right with YSM. Conversions are way down and the keywords and search relevancy is much, much worse lately. It certainly fells like something isn't right? Anyone?
To answer your question, we have not seen any major changes since the Adwords test announcement. To Hunsters point, YSM seems to have broken awhile ago and if you through the posts in this forum you will find others having major problems.