Just an update:
Everything went well, the only thing I didn't photograph, was the former KGB-building, I did go around and checked it out though.
Other than that, lot of things to see and photograph there, really beautiful city and probably even more so during summer (it was very cold there now, around -6 to -11 with wind).
Still, got a nice bunch of shots of the usual things around the Kremlin and also some nice shots of the subway system.
All, film-stuff was done with Ektar 100, need to develop those later today, down in the subway-system, I had to use my *D* camera on ISO 6400, to get anything useful (at Moscow Metro Ploshchad Revolyutsii ).
I never got to check out all the metro-stations worthy of a visit though, a good reason to go back some other time. (only 2 hours 45 minutes from here by plane).
Blog update from my trip.
Went too fast, so I need to take another trip I think, fun place indeed ^^
Again, thank you all for the tips, I felt pretty calm strolling around with my camera.