I really like this article at Psych Central by John Grohol. I like most of what he writes and this was especially good.
The article talks about the top 10 myths about mental illness, and I think it's quite bang on. There are a lot of misconceptions about mental illness (and mental health) out there. And really, there is still a huge amount of stigma attached to being mentally ill as opposed to physically ill. A huge stigma. You just don't talk about your relative in the psych ward the way you talk about your relative on the cancer ward.
In any case, it's worth a read.