xslidian

This sidebar widget will show the latest version numbers of most branches of Google Chrome.
There is also a tip telling if the user is using one of the latest versions of Chrome / Chromium.
Only the cron script will consume incoming bandwidth.

Latest Chrome

A widget including the latest Chrome downloads and a script to check if the visitor is using a latest version.

andrewfrazier

This plugin adds a sidebar widget to display links to the site’s RSS feeds, similar to the “Meta” widget but without the login or WordPress links.

GloDer RSS

A plugin to add a sidebar widget for RSS feeds of the current site.

Latest Chrome vs GloDer RSS