Google have boosted Android's streaming functionality, including the ability to not only choose apps from the Android Market through a desktop browser interface and then installing them to your device OTA, but also wireless music streaming from a home media store to an Android device. The latter works on the technology Google acquired when they bought Simplify Media.
In the demonstration, Google showed a full media library and then, with a simple tap of "push all", making that music available to the mobile device. The library could then be browsed on the smartphone and played over the wireless network.
There are still questions, like whether it can be used over 3G as well as WiFi, but it all looks very user friendly. Meanwhile the Android Market gets a new music tab which can be used to install audio.