I got my Google Spreadsheet invitation this morning. Yesterday I was watching the story unfold over at Google Blogoscoped and Dan posted a link to the Spreadsheets tour and sign up form (before it was even live). I quickly put my e-mail in the queue, so I imagine I was one of the very first (just minutes after Dan posted). Google Spreadsheets allows you to share your calendars with an unlimited number of people and I like pushing the limits of online services: when I first got Gmail, I started a conversation with my brother that has reached 451 messages (before they capped conversations at 150 messages). I'd like to do the same thing now and see how many people we can get editing one spreadsheet. If you have access to Spreadsheets and would like to join the test, send me an e-mail and I'll add you.