Question mark characters showing up in posts - ideas?

[jimdesade]

I'm getting question mark characters showing up in the middle of the text blog part of my site.

Daily Tang - Porn Review Video Blog (http://dailytang.com/vlog)

Wtf? Anyone ever had this problem with wordpress?
Can anyone recommend a good WP/php developer?

this site needs fucking help!

[Yahook]

Have you ever export or import your database? These mark characters could appear after these actions.