It looks like the upcoming release of Lightroom, which is supposed to bring compatibility with Leopard, may bring more. Todd Dominey wrote the following on the SlideShowPro News blog:
A frequent request from many, I’m pleased to announce that in the coming weeks we’ll be offering a plugin for Adobe Lightroom, the Windows / OS X photo management and editing software developed for professional photographers.
SlideShowPro looks interesting, and being able to have more output options from Lightroom is a good thing. But, hello! This might (emphasis on might, I know nothing, I’m not under NDA, etc) mean that the long awaited SDK is about to be ready to go. If so, that’s great news and will be a welcome feature in the next version of Lightroom.