Thanks! We've just sent out a new batch of invites, so everyone who posted here should have one. Let me know if not.
Ah sorry - you probably won't have recieved the first email with instructions on how to raise issues!
You can drop an email to firstname.lastname@example.org with 'Beta' in the subject, and it'll make it's way to me and the support team.
Thanks for the invite to test Beta but its still useless for uploading / syncing large files. Had my computer on for 3 days trying to upload a 20gb file - kept failing. Signed up to dropbox , done in 4 hours. NO contest!