After more time with Leopard, here are the positives:
* Crazy-fast, especially Spotlight. It has to be seen to be believed.
* Sharing network drives is much better – I would have paid the price of admission for this alone.
* Spaces is really cool – you can specify which space an application will launch on, so the micromanagement goes away completely. Apps like Aperture and Logic that really need a full screen devoted to them will co-exist with other apps on a single display much easier now, and all distractions go away as soon as I switch to their space.
* Reading John Siracusa’s excellent review makes me excited for the future – there’s a lot of potential under the hood, and I’m really looking forward to new displays with higher resolution in the next couple of years.
I did some work in Soundtrack Pro last night, with the laptop on my lap (running on the battery), and the work was fast and enjoyable. Good stuff, and I’m very happy with the result.