I might be the last person left on the planet who doesn't know that http://calendar.google.com is LIVE for more than two months! However, if you follow the link, you won't find any Google Calendar on it as it is currently only showing the Google Search Homepage. More confirmation that Google has plans for a Calendar about which I wrote in February.
However, if you can't wait till there actually is a Google calendar, there's another dynamic web based calendar that you could try out. Monket supports "drag and drop events to change dates, drag the start/end of an event to create multi-day events, create and edit events without refreshing the page, all with an iCal style interface."
Google Calendar Calendar Monket