Google Play: Music
I may be a little late on the bandwagon here, but has anyone seen the new Music service from Google? It lets you upload all your music to the cloud, so it is available anywhere, whenever you want it. You can play from iOS devices as well as Android devices.
I was initially worrried about size restrictions, but it seems to be uploading my 15,000 strong library without a hitch. Not so sure on quality though, I would assume it's all being reencoded to 128kbps. It reencodes to 320kbps mp3.
You can set it to scan a folder for upload, or scan an iTunes/WMP library and upload automatically.
I think it's probably more useful than iTunes Match since it allows a little more freedom (as with anything non-Apple)