TriTag helps you to get a clear MP3 collection by either creating a new filename out of the ID3Tag or filling the metatags using the information found in the filename using a user defined pattern - easy due to a pattern builder.
The first mode also allows to create a unique directory structure (artist/album/) similar to the one generated by iTunes "Consolidate library".
Search the FreeDB database if neither the filename nor the tag contains correct information.