Turn a user into a passionate customer before making them sign up
sachin.posterous.com
sachin.posterous.com
I feel more confident signing up and knowing I have a place to go where I can change settings, update content, delete comments, etc. With Posterous, I don't feel that confidence so I would tend to shy away from it and sign up with something like wordpress.com
The downside is that you will not be able to return to where you left off later on and all the changes you made during this simple demo run will be eventually deleted.
A site like yours requires ID and security tokens to function once you've established those things then a user is effectively "signed up" already.
I was meaning to redo this part to allow conversion form demo to real account. This will demo more sticky.