Randy Corman, Renton City Councilman for 14 years, has a blog that he updates nearly every day. Many people think Mercer Island could use televised city council proceedings, and I don't disagree, but a blog is so much better. You really get a sense of what a public official is up to.
Local officials and candidates send dozens of emails each day. They could save time by simply posting their daily thoughts on line and pointing others to it.
Incidentally I just noticed that Mike Cero has a regular newsletter (the latest was just published October 2nd). It's quite informative, and gives you a good sense of what he stands for. Too bad it's only in PDF, which is annoying to read on line and doesn't show up in Google searches. Still, it's much more information than you get about the other candidates, none of whom has any online updates that I can see.