Internet passwords are a real conundrum. To be safe, you should avoid using the same password for all of your accounts, you should regularly change your passwords and your passwords should long enough and with enough variation in characters to make them "strong."
Not everyone has the time to live in an ideal world, however, as evidenced by a blog post over on the WSJ's Digits blog.
They've put together a list of the 50 most popular passwords from the Gawker Media database hack and it shows that many people like to keep it simple, real simple. The top three passwords are:
Farther down the list are pop-culture references such as "starwars" and "trustno1" (from The X-Files), charmers such as "whatever" and "f—you" and prosaic choices such as "cheese" and "computer." To some, though, a password is just a lot of "blahblah."
See the whole list, along with some interesting analysis, at Digits.