If somehow you have made a mistake in requesting your invitation, or you simply want to change your hotels, it is
Visa to Russia
Step by step guide on how to apply for a visa on your own in USA or Canada and get all the online documentation in less than 1 hour from your computer
Transport in Russia
How to book trains online, how to go from the airport to the center of Moscow or St. Petersburg, how to use the Metro, how to go from Moscow to St. Petersburg...
Practical information to organize your trip: currency exchange (rubles), telephone and Internet, weather, safety and health, Russian products, Russian culture, etc.