The Lightroom 2 beta has two expiration dates. If you already own Lightroom it’s August 31st. If you don’t own Lightroom it’s 30 days after you started testing the beta.(A 30 day trial) I don’t think anyone disagrees that it’s important to reward the current owners for their purchase and use of the first version of Lightroom but we also don’t want to discourage new customers from providing feedback on the future of Lightroom. To that end, we’ve provided current Lightroom customers with the opportunity to invite friends or folks they meet on the forums to enjoy the beta through the end of August. Don’t be shy. If someone has taken the time to provide feedback on the forums and wants to continue using the beta beyond 30 days, send them an invitation. It’s a quick process and I’ve already sent many invitations myself.
The invitation link is here: https://www.adobe.com/cfusion/entitlement/index.cfm?e=labs_lightroom_invite
Enter your Lightroom 1 serial number to authenticate the process and you’ll be able to send up to 5 invitations at a time. (The invitee will receive an email with a serial number for use with the beta)