Ancestry.com produces a newsletter titled 24/7 Family History Circle. It publicizes recent changes to the Ancestry site, database additions and updates, and provides helpful comments on using the site in general. It also has links to previous editions all the way back to 2006, and it provides a link to the Ancestry Blog.
This is a great site to use to keep those database changes and additions from slipping by you. It can also alert you to databases that have been around for a while but which you have overlooked. If you are an Ancestry.com user (either at the library or through a personal account), this online newsletter will be helpful.
You can read the newsletter at: http://blogs.ancestry.com/circle/?m=200903