Which will you choose, a writer's Web site, a blog, or a wiki?
Decisions, decisions. If you're still grappling with the idea of setting up your own writing Web site, and wondering whether you should start a blog instead, here's another format to consider for your site -- a wiki.
The NYT article: "New Web Sites Seeking Profit in Wiki Model" describes startups which are basing their business plans on the wiki model, however companies have used wikis for their internal Web sites for years. The benefit of a wiki is that it provides an easy structure for a site which will be used by many people.
More info on wikis
I've got a PBWiki, which I use to keep information and notes for new projects; it's a private wiki. (You don't have to share wikis, or make them public, if you don't want to.) I recommend PBWiki highly (I've got no connection to the company) and recommend them -- a PBWiki is fun and easy to use. Whether you make your wiki public or not is up to you. :-)