http://toolbar.google.com/gmail-help...ifier_mac.html
While this is a great tool, if you have a busy inbox you will get bombarded with notifcations that might not be useful to you.
To solve this you can use Gmail's notifier app to only notify you of specific labels.
Here are the steps to set up a label only notifier.
1) Create a gmail label
2) Create a filter that labels your important email to your new label(click on blue filter link)
3) Install the notifier app
download from
http://toolbar.google.com/gmail-help...ifier_mac.html
4) Open terminal app
5) Use the following commands in terminal to setup your label notifier
defaults write com.google.GmailNotifier Label -string "importantemail"
to remove/reset the label notifier just run the following command
defaults delete com.google.GmailNotifier Label