Delicious and Tagging

I have always found search engines and tagging an interesting lesson in priorities and key words. If I think of "Blues", I think of music. When I used Delicious, you get all kinds of entries popping up, including mood and professional hockey teams. Programs and search engines seem to have a bias or a unique logic. "All the Web" seems very logical and less random than some of the other search engines. I suppose Delicious and other such programs allow personal input, but that can skew search results away from one line of thought down another one - which may not be the path you are thinking about personally. That is not necessarily a bad thing. Delicious is another search device that can be used in searching for sites that do not turn up on other search engines, giving me another tool to find things I am looking for.