pwarchive.com's Chords sheets are clean and generally correct, and on many songs the transpose function works beautifully. Check out their listing of top 50 songs viewed for the current month.
pwarchive.com has a tremendous amount of Worship Sets through member submissions over the years. Click here for the first page of many. Among their resources are a number of fine articles written by many well-known worship leaders and singers. See http://pwarchive.com/resources/articles.aspx.
The site is run as a non-profit, with a request for donations. For all they make available, and for the high quality, that really isn't too much to ask!