Adwords vs. Froogle vs. BING vs. Yahoo!

[aho2zds]

I conducted a recent, informal survey on FaceBook about which search engines & homepages my friends are using. I was surprised to find out that most of those that responded are using BING as either search engine of choice or homepage (or both). 2nd place was to Google, and a small minority are using Yahoo!.

I know Tim recommends using Google Adwords because it's the "largest and most sophisticated pay-per-click engine". I am wondering if anybody has tested their muse online using anything other than Adwords. The first 2 I am most curious about are BING and Froogle.

I'm not really asking for any help with testing a muse or anything. I would just be really interested and grateful for some input/insight on this topic.