From an article on TechRepublic entitled Don't be misled by these 10 Windows Vista myths, here is a summary of the myths. 

Myth #1: You'll have to buy a new, high-end PC to run Vista

Myth #2: Vista will solve all your security problems

Myth #3: Vista is no more secure than XP SP2

Myth #4: The only thing new about Vista is the eye candy

Myth #5: You can't dual boot Vista with another operating system

Myth #6: Vista requires (or includes) Office 2007

Myth #7: Most old applications and peripherals won't work with Vista

Myth #8: You have to buy a Premium version of Vista if you have a dual core machine

Myth #9: You won't be able to play ripped music in Vista

Myth #10: Vista costs a lot more than XP

Since I use Vista on a daily basis, I can assure you that these are false.