It's always exciting to see what's new in the latest version of your software of choice, but Apple really has pulled out a considerable amount of stops with this one.Logic Pro 9 has some amazing new features. Let's take a look at 5 of the most grin-inducing ones!
Flex time - This is the future of audio sequencing. You are no longer stuck to a single tempo - Flex time can change audio to a different tempo without losing quality. How is that possible you ask? I reiterate: we live in the future.
Organise takes - This is a nice one; Logic organises multiple takes into folders for you. You can even have chorus and verse takes in different folders on the same track. Saves having a zillion tracks; Score!
Sampler Instruments - You can now just select an audio loop and convert it into a sampler track. Logic slices it automatically. This means you can deal with it in terms of MIDI - re-arranging the audio on the computer with midi notes nice and easily, or even playing new loops with those slices with your keyboard. Woah.

Move tracks/settings between projects - Have the perfect Guitar setup on a different track? No more opening the different file, then dragging a million plug ins one by one - you can do it from within your project, just importing the plug ins/sends etc. you want. You can even import audio from different tracks and use Flex time to put it in time with your track.
Drum Replacer - Double up or replace your live drums with programmed ones! This is nice for everyone experimenting with a bit of Electro/Rock or wanting to beef up their Drum and Bass loops for example. No more faffing around with plug-ins - it's just there.
And as a bonus, apple have also included recordings from 3 pro artists including the killers so you can compare your mixes to that of the professionals. See what they've got on their tracks that makes them pop - then shamelessly copy them! Fantastic.