Following several quick-fire beta releases in the past few days, Apple has now released iTunes 10.5.1 final to the public, bringing along iTunes Match as well for the Americans. With iTunes Match, users can now sync their music from their iTunes libraries to iCloud for $24.99 a year. Apple has explicitly said only songs that are available on iTunes can be synced and no songs from outside will be allowed. There’s no limit to your uploads so get downloading iTunes 10.5.1 from Apple’s site here, or from your iDevice’s Software Update option, and begin making your illegal music legal.
P.S. Despite the public launch, Apple is still labeling iTunes Match as a beta product. Developers who have tested iTunes Match will continue receiving a free three months with their yearly subscription.