First of all Buying Tickets of Normal Cricket World Cup 2011 is a little easy but Tickets of big matches like Semi Finals or Final is not a easy Job. However you can try to buy the Tickets of ICC Cricket World Cup 2011 online. For this purpose there are several sites available which are offering tickets of World Cup 2011.
You can try this site for Tickets.
2011cricketworldcuptickets
You can try this site for Tickets.
2011cricketworldcuptickets