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Him being Dogboy, I'm sure he's looked into the visa process and everything he'll need for it. But, he said in his first post that his trip isn't until next winter, so it's too early for him to...

Try http://www.in-russia.net/vlad/ if you already haven't. They looked like they had some good stuff.
I'm assuming that you don't want to take an organized tour of the city, with pre-made...