And to this day, I know someone who likes Yahoo. How does she get there? She goes to Google (her default home page in her browser) and types "Yahoo" and then clicks on the link.
3 out of every 4 people i know (family, friends, clients) have their homepage set up exactly the same, plus the spybar installed and running. And when i ask "do you know how did it get there?"... i get "i wouldn't have a clue" in 99.9% of cases.