Over at Zunescene.com they have an article on how one would go about being able to share an MP3 with other Zune owners without having to worry about the three play limit. Seems easy enough. Read the whole article at Zunescene.com.

One of the early complaints about the WiFi sharing ability on the Zune was the rule that limits playback to 3 days or 3 plays on shared tracks. The Zune team eliminated the 3 day rule but left the 3 play rule intact with the latest firmware update. Many musicians who record their own music in the garage would prefer to share it free of this 3 play DRM restriction. Now there is an easy way to do it. 

It really is as simple as they say, the problem being is that you have to know what music you intend to share before hand since it requires you to make some changes to the music before you sync it to your Zune.