Much information is already available via WorshipWeb, an online resource for ordained and lay worship leaders.
Congregational pages about worship services
Sermons/Reflections/Services available on the Internet
Available under Creative Commons "share and share alike" license:
Available under insert other licenses here
OpenSong is a cross-platform application for managing chords and lyrics sheets, presenting lyrics (and custom slides) using a projector, etc. (e.g., Useful for worship leaders and musicians.)