ZD Viewers:

• http://free-dict.narod.ru - Free Dict for Windows Mobile
• http://dictviewer.appspot.com - Dict Viewer for iPhone

Dictionaries and Forums:

• http://dict.pocketz.ru - A big collection of ZD dictionaries
• http://4pda.ru/forum/index.php?showtopic=240267 - Dictan Forum
• http://4pda.ru/forum/index.php?showtopic=3504 - Dict Forum