I did have the info about Springsteen wrong, not ALL tickets were will call. Here's what they did to thwart scalping of the best seats (this is from the Ticketmaster press release):
"Tickets within the first 17 rows (floor sections 7-9) will be limited to one pair of tickets per customer for one show only, based on availability. These tickets will only be available through Ticketmaster charge-by-phone. Multiple orders of tickets for these rows will not be honored.
These tickets will not be mailed out. Customers who purchase these tickets must pick them up the night of the concert at Continental Airlines Arena Box Office (will call windows 13-16). Two forms of identification including the credit card used to purchase the tickets will be required. Upon pickup, the ticket buyer and guest will be escorted directly to the floor seating section."