I picked only this, because searching for everything should be too long.
500,000 Germans present by Leningrad you say? Wooow, thats a fantastic number, where you got this information?
Here are all German units, that were atacking Leningrad:
Infantry divisions No.: 291, 51, 269, 121, 86, 122
Motorized infantryNo.: 20, 36
Panzer divisions No.: 1, 6.
And the SS-Polizei division
German division had about 17,000 soldiers
If all of these divisons were on full numbers (though its not very likely to be truth, after all those fights), there were only max. 187,000 Germans there, not 500,000. (I think, that about 150,000, if not only 120,000 is more accurate)
Which day was that Zhukovs counter attack, you mentioned above?
My sources says, that Hitlers "Stop" order (stop to attack Leningrad, there were other battles i.e. on the east of the city, Tchivin etc., but not any other attempt to attack directly to Leningrad ) was given to Germans troops here in 12th September 1941. And the point is, that Zhukov was demonstrably in Moscow in 11th September, because in time between 17:10 and 21:15 he was in Stalins office. I cannot belive, that he should to get himself to Leningrad, to take command, to observe situation, to plan counter attack, and even to win it in only one day. In his "Memories and Thoughts" he was in Leningrad much earlier, even in 9th September, but it is not true, as many other informations there.

And no one of informations in this post is from Suvorov, ok?
Here are very interesting pages, i.e. there is a Stalins notepad here, where all his visitors are written out, with exact time of their visit.
And here is the situation of Leningrad (see the map, other is in Czech):
I verified these informations elsewhere too, so I think its true.