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Like the previously mentioned Gmail gadget, Google's own Calendar gadget offers quick access to straight-up GCal or Google Apps calendars, and allows for multiple instances if you're on lots of different schedules. Pull it up with the Shift-Shift tap for Desktop gadgets, and you can view your appointments in day-by-day, monthly calendar/agenda, or agenda-only view. Here's a full shot of what it looks like—while Google's blog post shows a map being drawn for location-specific items, it wasn't drawing on my screen for some reason.

Unlike the Gmail gadget, the Google Calendar Gadget runs on Google Desktop 5 for Macs and Linux, as well as Windows. It's free, requires Google Desktop 5 and a Google Calendar account.
Google Calendar Gadget [via Official Gmail Blog]
[IMG]http://www.pheedo.com/img.phdo?p=1[/IMG]