GmailUsers.com, “owned and operated” by Kathie Fry, is another interesting example of a site that could easily deliver a small (but nice for a single person) revenue stream without too much work. Matt Haughey’s PVRBlog and Wi-Fi Networking News by Glenn Fleishman are ones I’ve known about for a while, though Matt and Glenn (appear to) put in more effort on their sites. And Glenn’s might not belong to him personally any more.