I just got my ableton live 8 upgrade... Haven't installed it yet but very excited non the less.
Here's an overview of the new additions to live, including track grouping and cross fades, which were two features common on other music software platforms that I was very surprised ableton never had before.
And also, check out this tutorial video on how to create an awesome kick drum sample with the new effect ableton plugin Operator with just a sine wave... pretty awesome.