Homophonic keyboards from Don Livingston:
Multitran: A reliable online dictionary
Голоса site: Materials (including video exercises) for a popular Russian textbook.
Master Russian: Online Russian language materials.
Русский мир: Web site for the Russkiy Mir foundation. Contains language exercises and cultural informations.
gazeta.ru: A good source of daily news and opinion.
Новости НТВ: TV news from Russia with transcripts.