I don't think using others' newsletters and blogs a panacea for easy promoting. Newsletters and blogs that belong to other people are a great way of promoting but they do lack some of the benefits that you have if you run your own. That would be:
Having a newsletter and blog of your own is a lovely way to share what you know. And having one doesn't discourage doing that in others' newsletters and blogs, anyway!
Here's an example of a tip I submitted to Penny Sansevieri's "A Marketing Expert" newsletter.
Carolyn Howard-Johnson, author of This Is the Place; Harkening: A Collection of Stories Remembered; Tracings, a chapbook of poetry; and how to books for writers including the award-winning second edition of, The Frugal Book Promoter: How to get nearly free publicity on your own or by partnering with your publisher; The Frugal Editor: Put Your Best Book Forward to Avoid Humiliation and Ensure Success; and Great Little Last Minute Editing Tips for Writers . The Great First Impression Book Proposal is her newest booklet for writers. She has three FRUGAL books for retailers including A Retailer’s Guide to Frugal In-Store Promotions: How To Increase Profits and Spit in the Eyes of Economic Downturns with Thrifty Events and Sales Techniques. Some of her other blogs are TheNewBookReview.blogspot.com, a blog where authors can recycle their favorite reviews. She also blogs at all things editing, grammar, formatting and more at The Frugal, Smart and Tuned-In Editor .