It’s critical that Adobe help developers get up to speed in updating their plug-ins to run natively on Intel-based Macs, so we’ve posted a Photoshop CS3 mini-SDK that contains the needed info. The SDK, along with the CS and CS2 versions, is a free download once you fill out a simple form.
We’ve been working with many developers for several months, and some plug-ins (e.g. Noise Ninja) have aready been updated to run natively. Hopefully the wide exposure of the public beta will help the needed info reach the developers we haven’t already been able to contact.
On a related note, developers may want to update their plug-ins to be able run as non-destructive Smart Filters in CS3. The docs are a bit scarce on this point since we wanted to focus on the Mac/Intel issues, but the Dissolve example in the SDK includes the Smart Filter flag.