[billycao]

I might subscribe to the oft-repeated mantra to not fix what isn't broken, especially considering that users cannot view other users' calendars, so mediocrity or spam is not of a major concern to you.

That said, awesome app. It's certainly a problem I'm sure many are constantly faced with. (I know I am) My first impressions though include a lack of detailed info (how does it work?) compounded by the inconvenience of making an account for the site. (I still haven't registered)

Edit: As for a small change you can do right away, I feel like users would consider "John Doe" <[e-mail]> more intuitive than "Invite Name" <Invite Email>. (Consider making the name optional altogether or just having a more intuitive input method, like multiple <input> prompts)