Scott's Gmail Alert is a free email alert system for Gmail accounts which quietly sits on your taskbar until it discovers new mail in up to five separate accounts. Send quick emails without logging in to Gmail directly, including replying to received messages and website email links. Set eye catching colors to alert messages to help differentiate important emails from others, using either the default or Windows Aero Glass theme.
Update 4.5
New Feature:
Date Display improved
Fixed: Sounds play when alerts are selected to popup until cleared
Fixed: Sounds wont play when in fullScreen mode.
Tweaked: Weather Display tweaks.
Tweaks: Mailto links with subject and body text is handled correctly.
Tweaks: Default Mail setting can be disabled.
So far over $240 has been donated to the Gulf Coast to help clean the animals!
Google Buzz support is in The Works at the moment.