- Twitter – if you have a large enough following you can request invites. I have given and received beta invitations via Twitter
- Invite Room on Friendfeed – Mark Krysnky created an invite room on Friendfeed where invites can be offered and requested.
- Mashable Invites – Mashable has a beta invites site. You need to register and then you can offer your extra invites and request invites for sites that you want to access. Some of the lists are long but I’ve never found it to take too long to get an invitation.
- Invite Share – Invite Share is updated with new sites that frequently but for the sites listed it does not take very long to get to the top of the list. Priority is given to those who give out more invites. It is also necessary to register with this site. I’ve received invites very quickly through Invite Share.
Keep in mind that all of these sites work best if you are a good citizen and give out as many invites as you request.
If you know of any beta invitation sites, please let me know in the comments.