NEW: Rip AAC Old School v0.9
Now that iTunes doesn't rip or convert AACs using constant bit rates (see this MacFixIt article), users of Join Together can't take advantage of the Pass-through option, which encodes the final joined file much faster. Rip AAC Old School is an AppleScript wrapper for the command line tool afconvert. It will rip CD tracks as AAC using Constant Bit Rate (CBR) so that ripped tracks will all have the same bit rate. I tested it pretty thoroughly here, but I'm still keeping my fingers crossed.