I tried to obtain a ticket in the main sale, but like a lot of people wasn’t able to get a ticket. Apperently only one in four people were able to get tickets and a lot of people registered more tickets than they needed. Here is a blog post from Bruning Man org (BMORG) about this: http://blog.burningman.com/2012/02/news/burning-man-addresses-2012-ticket-situation/
All info on tickets can be found on http://tickets.burningman.com/
The next official sale starts March 28th, but will only have 10.000 tickets, the bulk of tickets (40.000) were already sold in the main sale.
Hope BMORG finds a solution. I was hoping to go to Black Rock City this year.