Here are free websites that you can post prayer requests/intentions on. You can post your name or do anon. Also, you can post for others too.
http://www.oswc.org/VotiveChapel/Default.asp
http://www.faithjourney.net/prayer_requests/addentry.php
http://www.chicagomonk.org/prequests.html
http://www.udayton.edu/mary/intentions/intentions.html
http://www.teresians.org/prayer_request.htm
http://www.littleflower.org/prayers/petitions/add.asp
http://www.americancatholic.org/PrayerIntentions/default.asp
http://maryknoll.com/cgi-bin/postaprayer.cgi
http://www.lourdes-france.org/gb/gbpriere.htm
http://www.ourladyweb.com/mary-prayer.html#post
http://oblatesusa.org/Prayer.aspx?path=root/momi/Prayer/PrayerRequests
http://www.virtualrosary.org/postprayer.php
http://www.oswc.org/VotiveChapel/Default.asp
http://www.faithjourney.net/prayer_requests/addentry.php
http://www.chicagomonk.org/prequests.html
http://www.udayton.edu/mary/intentions/intentions.html
http://www.teresians.org/prayer_request.htm
http://www.littleflower.org/prayers/petitions/add.asp
http://www.americancatholic.org/PrayerIntentions/default.asp
http://maryknoll.com/cgi-bin/postaprayer.cgi
http://www.lourdes-france.org/gb/gbpriere.htm
http://www.ourladyweb.com/mary-prayer.html#post
http://oblatesusa.org/Prayer.aspx?path=root/momi/Prayer/PrayerRequests
http://www.virtualrosary.org/postprayer.php