Ask YC: What to have on site while under construction?

A friend and I are working on developing a website but we aren't finished yet.

We want something to put on the domain until it is ready.

We are thinking of having a blurb of what we are making, contact info and an email sign up list.

Anything else sites under construction should have?

You should be thinking about who will have found your site pre-launch, why they will be there, and how to get them to come back again once you're done.