Apple is providing web access to comprehensive documentation for the Pro Apps at Help Library. It seems similar to Adobe Help (formerly known as LiveDocs).
Update: Owen’s Photolog has some humor in How to Install Final Cut Studio 3.
Update 2: whoops, Owen was right -- "Rendering PAL material to ProRes 4444 in Color introduces a gamma shift."
Update 3: In Final Cut Pro 7: Create your own manual Alex Gollner explains how to convert the Final Cut Pro 7 html-based help system to a single document manual.
Update 4: Apple posted the FCS manuals in the Help Library under View as PDF.