Bot A Blog.
People invariably ask me for resources that will e-mail them new entries in weblogs (this usually happens after I push aggregators). I usually point them to Bloglet, which has been around for a while (although I'm still not sure if it is still running), but now I can add Bot A Blog, which has similar features.
Bot a Blog will only work with sites that have RSS feeds. You enter the URL for the site (Bot a Blog has auto-discovery so no need to know the URL of the feed) and your e-mail address and it will e-mail you whenever the weblog is updated. I signed up for my blog, so hopefully I'll receive an e-mail shortly after I publish this.