If you aren't familiar with Google Chrome or it's newly released
update that includes extensions, I would recommend reading my
first post. This post is highlighting another excellent Chrome
extension:
One Number.
There are many extensions for Chrome that will display new
message notifications for a specific service, like your GMail or
Google Wave account. One Number eliminates the need for multiple
extensions by showing you a single number when you have new
messages. This single number combines all of the following services
together:
- GMail
- Google Reader
- Google Voice
- Google Wave
Any time you open Chrome, the One Number extension will display
the total number of new messages:

The extension icon displays the new message count. As you can
see in the screenshot above, you can view messages per service by
hovering over the icon. You can also click on the icon to show an
expanded view:

The expanded view allows you to manually refresh the list to
check for new messages and provides quick links for each service.
You can also select the Open Unread link to load each service
with unread content into a new Chrome tab.
There are a lot of customization options for One Number as well.
To change options, open the customize menu (the wrench icon) in
Chrome and select Extensions.
Locate the entry for one number and select Options on the right
to customize the extension. You can control the refresh interval,
notification colors, and options for each service individually.

This is a great extension, the interface and combination of
features are a great example of why extensions are so popular in
the browser community.