This may not mean that "passwords are getting better." It may just prove once again that people care more about their personal things than other people's stuff.
Myspace users are likely to be younger, and although stereotypically they are not renowned for their spelling ability, they will be more technology aware than the average corporate user. Myspace users are comfortable with the internet and use it for leisure, whereas at work those who otherwise wouldn't mix well with technology are forced to cope.