The title pretty much says it. You can now stream from local subnet iTunes, Banshee, mt-daapd/Firefly hosts.
Assuming you have Zeroconf set up - I will be adding a "add host" button for users with KDE 3.3 and I suspect the great majority of users who don't have Zeroconf set up at all. At least under Linux, Zeroconf is an ironic name as I actually had to edit some /etc files to get it to work. However to be frank, I'm sure most of our users know what a hostname and an ip address is; shouldn't be too painful to suggest they add hosts manually until Zeroconf configuration difficulties get ironed out. Hopefully the distros work it out, as I bet some of them already are.
Currently its kind of hidden, you have to go to Amarok Configuration and add a "DAAP" media device. And then click "connect" in the media device tab. Assuming you have Zeroconf setup, you should see any local DAAP (aka Music Sharing) servers. I hope to integrate it into the collection browser in the near-future.
In a nifty example of code re-use, the Ruby proxy written for Last.fm doubles as the proxy for DAAP. Last.fm needed a proxy to take out the "sync" commands; DAAP needs a proxy due to silly post-4.5 iTunes requiring DRM-like hashes to be part of the HTTP GET command.