Lectio Praecursoria on my PhD dissertation titled "Search Interfaces on the Web: Querying and Characterizing" given in ICT building, Turku, Finland on June 12, 2008 Thesis contributions: * Querying search interfaces * Deep Web characterization * Finding web databases The text of thesis is available at http://www.slideshare.net/denshe/shestakov2008-search-interfacesonthewebqueryingandcharacterizing