From hobby to commercial Web search directory to online media powerhouse, Yahoo has endured many changes <A HREF="http://news.zdnet.com/2100-9588_22-5595552.html?tag=zdnn.alert">during the past decade,</A> riding a largely serendipitous wave to emerge as one of the most successful progeny of the dot-com boom. Survival has brought sweet rewards in the form of booming revenues and profits, and a surging stock price.