How to join audio tracks into a single audiobook? I am looking for a solution to join entire CD to a single audio file, preferably with chapterizing functionality.

Usually, Join Toghether should do the job but this solution doesn't work anymore with Lion and I am looking for a solution that works with Lion.

I mention that most of my files are in AAC Lossless format and I don't want to convert them to something worse. I tried Audiobook Builder but it seams to not be able to build lossless files.
Rogue Amoeba's Fission will do what you want. It costs US $39 but it has a limited trial demo you can download. It is a lightweight lossless audio editor. The publisher reports no compatibility problems with Lion.