Txs to Dan Brickley I have thius info about some issues I mentioned in my review.

1. About the invitation that was lost.  Find here an article with a solution : http://www.joostteam.com/2007/05/12/how-to-get-joost-working-when-your-invite-went-in-the-spam-bucket/.  But as Dan told me, Always download the latest version of Joost directly on the Joost site and not from another site where it is possible that you download an old version.
2. About using multiple accounts : Dan hopes Joost will solve this in the future, so you can easily switch between accounts.
3. About the resending of an invitation : The people of Joost will look at it.

I'm very pleased that they reading blogs and reviews on the web, and take care of what people are saying. 

I'm playing more and more with Joost.  So if I found something interresting, I will let you know.

A good site with info arround Joost and a forum is JoostTeam.

(Article updated on 16/05/2007).