How to set up and use iTunes Match

[iMore.com]

iTunes Match allows you to stream purchased music from iTunes along with any other music you have saved in your iTunes library to any of your registered iOS devices. That means you can listen to your tunes ?*any purchased music + up to 25,000 songs from your personal library ? anywhere you have a data connection, without taking up tons of storage space. To get started, all you've got to do is subscribe and enable iTunes Match on all of the things!

Full story from the iMore Blog...