I haven’t yet used this software myself, but it’s free only for the next 12 or so hours, so I wanted to pass it along quickly. Normally $25, it looks like it might provide a streamlined workflow for importing audiobook CDs or converting existing MP3 files to AAC for better bookmarking capabilities.
Free for 12 more hours (on 19-December-2006): Direct Audio Converter and CD Ripper
Note: You need to download, install, activate, and register the software (four distinct tasks) before the deadline, when the registration code expires. Read the instructions for the details.