The SF Giants use a variable ticket pricing scheme that seems to be pretty successful. It adjusts the price of tickets based on projected demand. This probably does a pretty good job at eating into scalpers profits (although not entirely). Of course baseball ticket demand is a lot more predictable due to the fact that their are ~80 home games a season.
It would be interesting to see if there was any way to implement a similar system for concerts and shows.
"My guess as to what will eventually happen if / when Live Nation and TicketMaster merges is that they'll move to an auction or market-based pricing scheme - which will simply mean it will cost a lot more to get a good seat for a hot show. They will simply BECOME the scalper, eliminating them from the mix."
It would be interesting to see if there was any way to implement a similar system for concerts and shows.