For version 2.4 I was able to find a .chm containing the whole reference somewhere. It was excruciatingly slow, but still much more useful than the online HTML version that doesn't have an index to quickly get to the classes you're looking for. A table of contents is fine for reading a book, but not as a reference. Not to mention it doesn't work at all without internet.
Is there an SDK reference, with an index, that can be downloaded for version 2.6 ?