Forum Moderators: rogerd
If you are going to let visitors comment, check out how easy it is, whether you can moderate comments, and what kind of spam prevention features exist.
To drive traffic to a diary site, I'd do a few things:
1) Get some content out there. Make sure it's interesting; edgy or controversial might be even better. You need content both to drive traffic and links, plus to give those who visit a reason to return.
2) Start soliciting links - directories, similarly themed sites, etc.
3) Be sure your site is readily indexable by search engines so that as they begin to find your site they can pick up your content. WebmasterWorld is the right place to learn about how to set your site and pages up for good indexing and optimal rankings.
4) Work on the community features of the site to bring people back.