Cyrillic (Russian): instructions for Windows and Internet
Instructions for a non-Russian Windows: Cyrillic fonts included into Windows, standard and phonetic (transliterated) Russian keyboard layout, how to tune-up browsers/Mail/News software - Netscape and Internet Explorer/Outlook Express; Cyrillic in Unicode-based programs (MS Word, IE/OE)
http://ourworld.compuserve.com/homepages/paulgor/

FontBoard
Freely downloadable keyboards for Arabic, Cyrillic, Esperanto, Hebrew, Maltese and Yiddish. They can be used in Windows 2000/XP as well as in Windows 95/98/ME. The site is maintained by Gyula Zsigri.
http://zsigri.tripod.com/fontboard/

Tavultesoft Keyman
Tavultesoft Keyman allows you to create your own input methods with a visual interface or a powerful programming language for just about any language in the world. It works with nearly all Windows-based applications and best of all it is free for personnal use.
http://www.tavultesoft.com/keyman/