Freely Accessible Online Dictionaries
If you haven't yet, take a look at Das Woerterbuch-Netz (http://germazope.uni-trier.de/Projects/WBB/woerterbuecher), produced by the Digital Text and Data Center at the University of Trier. It provides full-text searching for a number of a German-language and German dialect dictionaries, including the Deutsches Wörterbuch and Mittelhochdeutsches Handwörterbuch von Matthias Lexer.