It's been a long time coming but it's finally here. Yup, CodeIgniter 2.0 has been released.  Best of all, it comes in two flavours: Core and Reactor.  

For those who want to stick to Ellislab development cycle, Core is for you.  Quite simply, EllisLab use the Core version of CodeIgniter to develop its commercial products such as Expression Engine and MojoMotor.  

Reactor on the hand is community driven and will enable faster adoption of submitted code to the framework itself.

To see a list of the changes that have been made, why not download a copy of CodeIgniter 2.0 and have a read through the changelog