A week ago, I began my quest to find a new default search engine. Last week, I used Yahoo! exclusively. How did it fare? Just fine. I was perfectly content with it all week. I found what I was looking for 99% of the time, and the rest of the time, it was equally difficult to find what I was searching for anywhere else. So far, Yahoo is in the lead, and this week is MSN Live's turn. Next Monday, I'll report on whether or not it topples Yahoo from the lead spot.