One question I get a lot from iTunes users is this: how can I remove duplicate tracks from my iTunes library? iTunes has a feature that can display duplicates, but it’s not very good. If you choose View > Show Duplicate Items, iTunes will analyze your library, then show any items that it thinks are duplicates. The problem is that it only checks for dupes by looking at a track name and artist name. If you have, say, studio and live recordings by certain artists, those tracks will show up as duplicates.
Doug Adams’ $8 Dupin Lite does what iTunes can’t: it allows you to check by multiple criteria, and also by the ones you want. So you could look by, say, track name and artist and time, to find tracks of exactly the same length. Or you could look by track name and bit rate, so, if you have files in two formats (such as lossless and compressed), it won’t match those tracks.
When you want to cull your iTunes library, and check for dupes, Dupin Lite is the best place to go. While you’re at it, check out the Doug’s AppleScripts for iTunes web site, where Doug Adams has hundreds of AppleScripts that can help you manage files, tags, tracks and much more in your iTunes library. I couldn’t live without Doug’s scripts.