It is "CalWidget" from the market. Once you download it, go to the desktop menu and select widget. There you are given a bunch of sizes to select from and settings to determine the opacity and color of each item. The bigger the size, the more you see.
This works with the onboard calendar, which in turn works with your google calendar.
It is simple, customizable and shows what I want.
Let me know if you have any problems I can help with.