The main reason why PDF files would be a baaaaaad idea because, at least on a Windows PC, it really takes a while to load a PDF in your browser. In fact, I installed a Greasemonkey script that shows a little icon next to PDF links, because I really, really, really do not want to open them unless it's absolutely vital. And then I prefer downloading them and reading offline, but with a simple e-mail newsletter, I just wouldn't care enough to do that. Besides, most e-mail newsletters are in HTML, and they look just fine to me, so I don't see any reason to take any unnecessary steps to do something trivial as sending out e-mail newsletters that end up in the virtual garbage bin after being read.
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