I have two invitations to the PopFly alpha available. I want to give them to a K-12 teacher or student. I want them to go to someone who will really use them. Someone who wants to do a cool mashup or build a really experimental, interactive web page. Check out the PopFly overview site and if you are really interested and don't want to wait for the "sign up for and invitation as wait" option let me know why I should send you an invitation. Send email to AlfredTh at microsoft.com with what your plans are for PopFly and where you teach or go to school. I'll send invitations to be two best responses I recieve before Friday midnight Eastern US time.
Edit: Brian Scarbeau is blogging about his experiments with PopFly. I have a couple of additional invitations now - for teachers/educators please. There is a request process at the site for everyone.