The full life of St. David, along with a few miracles are available here in Greek: http://www.pigizois.net/agioi/david_evoia/david.htm. Additional miracles of St. David (in Greek) are available here: http://orthodox-world.pblogs.gr/2008/11/o-osios-dabid-o-en-efboia-thaymasth-emfanish-se-mikro-paidi-eort.html, http://www.gerontas.com/content/view/873/171/.
Elder Iakovos Tsalikis (of blessed memory), was drawn to the monastery of St. David (originally built by him in 1540), where he stayed, became a grace-filled spiritual father, helped many people, and also renovated and renewed the monastery through the intercessions of St. David. Thus both St. David and the blessed Elder Iakovos have made the Monastery of St. David in Euboea a great pilgrimage of Greece. For more on Elder Iakovos, see the audio recordings by Constantine Zalalas (http://www.philokalia.org/elders.htm), Precious Vessels of the Holy Spirit: The Lives and Counsels of Contemporary Elders of Greece by Herman A. Middleton, and The Garden of the Holy Spirit: Elder Iakovos of Evia by Professor Stylianos Papadopoulos. Pictures from the Monastery of St. David are available here: http://www.rel.gr/photo/thumbnails.php?album=58.
(http://www.arxontariki.net/viewtopic.php?f=177&p=5565; the Paraklesis service of St. David of Euboea is available here: http://www.scribd.com/doc/21691319/%CE%8C%CF%83%CE%B9%CE%BF%CF%82-%CE%94%CE%B1%CF%85%CE%AF%CE%B4-%CE%95%CF%85%CE%B2%CE%BF%CE%AF%CE%B1%CF%82)
Through the prayers of our Holy Fathers, Lord Jesus Christ our God, have mercy on us and save us! Amen!