Sure, iTunes can join tracks, but only if they're consecutive CD tracks, and you haven't imported them. This script allows you to join any two (or more) MP3 tracks (repeat: MP3 tracks only), provided that they are the same format and bitrate.
Also see Join Together, an application that will join any type of files.
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Display, create text file listing info of dead tracks
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Export album artwork as folder.jpg to Album folder
downloaded 21m 19s ago
Export artwork of selected tracks to parent or specified folder
downloaded 22m 32s ago
Restore each selected track's artwork from an image file stored in its Album folder
downloaded 25m 38s ago
Exports and then re-imports selected tracks' artwork
downloaded 41m 16s ago
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