The next version of the Mac operating system will be the biggest release for developers in Mac history, says Apple.

Apple's Chris Bourdon recently demonstrated some of the new features in Mac OS X Tiger to a group of developers at the O'Reilly Media Mac OS X Conference.

Of the next iteration of the operating system he said: "The good news: It has by far the most features and capabilities than any other release. The bad news: There's a lot to learn, so it's going to take some time to get familiar with it."

This was the second up-close look at Tiger since it was previewed at Apple's Worldwide Developer Conference in June, according to O'Reilly.