Since the 1st of June, Ubuntu Dapper Drake has been officially released. Ubuntu Dapper Drake brings a lot of new facilities for users and system administrators.

LTS stands for Long Term Support as the Ubuntu team
This release is going to be supported for 5 years. Server Edition includes a unique mechanism to set up a certified LAMP system.

Much more is included, give a look at the official page from ubuntu [2] if you want to know more.