Apple has released iTunes 10.5.1 and along with it, their paid music locker service in the U.S., iTunes Match. Coming after several extended betas, and past the previously announced October time frame, iTunes Match costs 24.99 a year and allows users to scan their iTunes libraries and either gain access to matching, 256kbps tracks from the iTunes Catalog, or upload their own, off-catalog tracks for access from any iPhone, iPad, iPod touch, or iTunes client on Mac or Windows.
While the general public gets their first taste of iTunes 10.5 today, Apple isn't wasting any time moving developers up to iTunes 10.5.1 beta. Like other recent betas, it includes iTunes Match functionality for further testing.
If you're a registered dev, grab it via the link below: