This document discusses Manuscriptorium, a digital library of medieval manuscripts hosted by the National Library of the Czech Republic. It provides catalog records, digital images, and full texts of manuscripts. The document outlines different levels of Manuscriptorium's network across various countries and regions. It describes Manuscriptorium's personalized "My Library" environment, which allows users to create virtual collections and documents from resources on Manuscriptorium and other sources for individual and collaborative work. The document explains how "My Library" can be used as an editorial workshop and tool for publishing editions of manuscripts online. It notes that Manuscriptorium represents a paradigm shift towards virtual environments and digital humanities.