The latest version of CodeIgniter, has been announced by EllisLab.

This version includes the new Form Validation library as well as a load of other changes / fixes as detailed in the Change Log

The Style Guide has some good suggestions, some of which may go against your own writing style, but I'm all for an attempt at standards within CI! As a relative newcomer to CodeIgniter I'm still learning the ropes, but some element of 'best practice' to follow is very helpful!

I've had to go ahead and change the source code from my own applications but it has been quite a rewarding experience.