We are about to switch to a new forum software. Until then we have removed the registration on this forum.
There's still some spaces available on a Praxis LIVE workshop I'm leading in Athens this Friday (March 31st) as part of Electric Nights - http://www.medeaelectronique.com/electricnights/portfolio/an-introduction-to-using-praxis-live/
This will cover the main interface, as well as building custom components / live-coding Processing.
More on Praxis LIVE at http://www.praxislive.org