Well that and we've spent so much time on the main app that we don't have a workable login yet - our login process is akin to 37signals where we subdomain the account i.e. yourcompany.domain.com so it's not that straight forward.
So for us it's literally too early to release since no one could sign up.
One thing we could do is have a signup with an email for news of our pending release... but we're still fine tuning exactly what message we want to release with.
This may be a huge mistake on our part but only time will tell. I'll be sure to share our experience releasing 'late', good or bad, with the HN community.