iTunes Capitalizer is a Applescript driven by Perl to quickly capitalize each word in a selection of iTunes music. For example:
"a song like this" would become "A Song Like This" (Capitalize)
"A Song Like This" would become "a song like this" (Lowercase)
"a song like this" would become "A SONG LIKE THIS" (Uppercase)
Processing songs by Name, Artist, Album, and Genre all at once is achievable as well as individually.
This script comes with an installer to make sure that it goes in the right place on your system. Older copies will automatically be updated as well.
You can access the script via the iTunes script menu. Look for:
(NNSW) iTunes Capitalizer