Key Advantages of IPv6 over IPv4

here i am mentioning some key advantages of ipv6, why we should switch over to it , why its more important now and is there no long ipv4 exists??????

I think dat these points will surely give you some overview of ipv6 too:

• Addresses are assigned to interfaces
  • No change from IPv4 Model
• Interface can have multiple addresses
• Addresses have scope
  • Link Local
  • Site Local
  • Global
• Addresses have lifetime
  • Valid and Preferred lifetime
• Self Configurations of workstations
• Security Features
• Support Mobile workstations
• Backward Comptiablity with IPv4
• End-to-End security Model
  • Protects DHCP
  • Protects DNS
  • Protects IPv6 Mobility
  • Protects End-to-End traffic over IPv4 networks
•  Larger Address Space
• Efficient and Extensible IP datagram
• Efficient Route Computation and Aggregation
• Improved Host and Router Discovery
• Mandated New Stateless and Stateful Address
• Autoconfiguration
•  Easy renumbering
•  Mobility support
•  Mandated Security for IP datagrams