Maybe. It'd depend on how it works, I'm afraid.

Do you find that your DW journal gets you much exposure from non-DWers?

I'm fairly sure it gets none, to be honest, but I'm not expecting it to get a lot anyway. WordPress has a much easier and far more accessible OpenID structure than DW does.

And if you go for a self-hosted blog be prepared to deal with spam even if you invest in Akismet's spam prevention or similar.

<3