Similar as GMDesk, TrayOS is a lightweight application that brings a handful of Google Apps to your desktop. This application enables you to quickly access 12 Google services from desktop (GMDesk has only half the number).
The available services are Gmail, Google Calendar, Google Reader, Google News, Google Maps, Google Docs, Picasa, Google Translate, iGoogle, Google Adsense, Google Analytics and Google Adwords.
From the main window, you can access and switch between different Google services from the tab menu, shown at the top panel. But it will be good if keyboard shortcuts are provided. You can rearrange the tabs by simply dragging them.
In the settings page, you can choose which services to be displayed on the tab menu and also specify which services that you want to be started automatically in background mode.
TrayOS is compatible with Windows 2000, XP, 2003, Vista and Windows 7.