Google Wave Checker
This extensions checks for new Waves in Google Wave and displays the number in Chrome or Iron. If you’re not logged in Google Wave, it will prompt you to login and redirect you to the classic Google Wave site in order for you to login.
Features:
Check new Waves
Prompt for Login to Wave
Install:
http://dev.jeremyselier.com/wave-extension/wave-extension.crx
Homepage:
http://www.jeremyselier.com/fr/entry/chrome-extension-google-wave-checker/