Last year, Google Calendar tested a feature that made it easier to schedule events with guests. The "sneak preview" was only available for a few months, but now it's back. Google calls it "find a time" and you can use it when you create an event. "If you're able to view your guests' calendars (via sharing, Google Apps shared access, or because they've made their calendars public), you'll be able to compare schedules and pick a time that works for everyone," explains Google.
Google Calendar redesigned the page that lets you create events and added a more intuitive dialog for repeating events. "The old interface for creating recurring events was clumsy and took up too much space on the screen," admits Google. "Now you'll see only a summary of your recurring event on the main event page; if you want to edit it, you can use a window that opens when you select the 'Repeats' checkbox."