As I use the service more and more, I’m finding features that just blow me away. Here’s a list:

1. When adding a new event and entering its description, when the description box gets nearly full, it magically expands. It grows and gets bigger to accomodate the content you’re typing into it.
2. You can easily add Guests to events, and give them permissions such as “Guests can invite others” and “Guests can see guest list”.
3. The month view makes it easy to see all-day events differentiated from the events that occur at a certain time. For AM, it just has the number of the time. For example, 11 AM appears as 11. For PM, it shows the hour followed by p. 2 PM appears as 2p.