Spiffy is a Gmail notifier for Windows, it's free and totally customizable.

Changelog:
added option to change log window text and backgroud color
added new feature 'check for new mail on startup' (Thanks Anders)
added option to customize 'Open Gmail' location
fixed bug with 'Open Gmail' when browser was not started (Thanks Mike)
fixed several other small bugs

Program Information Category: Tools and Utilities Type: Free Version: 0.4.3 Size: 608KB Works on: Windows Product page: here