SUNDAY PREP SITES
LectorPrep.org: Since 1999, this site has been the most helpful online resource we know of for preparing Sunday and Holy Day readings. Developed by seminary-trained author, Greg Warnusz, it includes introductions for presiders to give the assembly before the readings begin, historical insights, theological background, numerous tips for proclaiming more effectively, articles and reader discussions beyond what's in this site.
Weekly Proclaiming Tips: A weekly video series of insights and tips in a friendly and conversational manner for proclaiming the Sunday readings, by Lisa Belleci St. Romain.
Lectorworks.org: A preparation site by ministry veteran, Paul J. Schlachter. Includes commentary and suggestions for proclaiming the readings, and an archive for the three-year liturgical cycle of Sundays and special days.
SundayPrep.org: This is the most extensive site for Sunday Mass preparation that I know of. Filled with homilies from an extensive array of well-known priests, bishops and deacons, reflections on the readings for children, music, videos, commentary from popular lay ministers and much more. Totally free. No ads. No donations.