Cheezy, there are tonnes of Stalinist apologists on the web. As something of a Russophile, surely you've come across them even more than I have. There are people on these very boards that deny the Katyn Massacre ever took place.
Of course I have. The "oh please" was in response to the Holocaust denier part.
I'm aware that not everything Stalin is blamed for is accurate. Then again, neither is half of what you seem to imply that Aleksey_aka_al reports accurately.
Such as?
As for popular history, I'm not a fan of it. I prefer my books to be scholarly, thank you very much.

Though I freely admit that most Russian internal politics are virtually unknown to me, I'm pretty familiar with their external policies at the time in question. But still, since I acknowledge that you're far more knowledgable about this matter than I am, are there any online sources I could check out? I'm not really in a position to be buying new books right now, but if there's some I'm likely to find in a local library that would help too.
Another View of Stalin is probably the best tool (and the one that focuses primarily on finding the original "sources" of "facts" about him and this time), but finding one of the more honest Russian Historians can satisfy much of the demand. Avoid anything by Robert Conquest like the plague.
The five-part series "The Industrialization of Soviet Russia" is a valuable tool as well, but good luck finding Volume 4. I can't. Anywhere.
Poland did refuse to allow Soviet troops to advance through Polish territory, though one can hardly blame them considering their history.
The Polish intelligensia's sociopathic revulsion with leftism of any form led them to choose Nazism over any type of socialism.
Still, Stalin's excuse that he advanced into Polish territory to protect the ethnic Russians and Poles from Germany was just that; an excuse. The Molotov-Ribbentrop Pact provided for the partition of Poland. If the USSR was really only interested in defending itself from Germany with this buffer-zone, why then not give the territory back to Poland at the conclusion of the war?
Because the land they took (and gave to the Belorussian SSR, not to Russia) was land taken
from them by the Poles in the 1920-21 war. Notice they didn't take all of Poland in 1945, even though they controlled it all and could have cooked up justification for it because it was part of the Empire at the time of the revolution.
Not all the territory gained by the Belorussian SSR had been Russian territory before Poland invaded in 1920, so revanchism doesn't really apply either. It was a land grab, as proven by Russian co-operation with Germany and the treatment of the locals by Russia.
No, it represented the line that Stalin and Hitler had agreed neither would advance beyond should a war with Poland arise. The purpose of that line being that either country controlling more of Poland than that would unnecessarily antagonize the other, and neither wanted war at the time.
Personally, I don't really care if it was the exact territory or not, the goal of international socialism is to destroy all nation-states, precisely because these divides are completely arbitrary and divide people where they should be working together. But it is worth noting, however, that by the 1940s the Soviet Union had lost much of its internationalist-oriented foreign policy (and, really, drifted in general from the radical leftism of the 1920s), and that old Russian patriotism had reasserted itself. This was partly due to Socialism in One Country, because, after the failure of the European revolutions of the 1910s and 20s, the USSR was the only remaining strong socialist movement, and thus the future of socialism and the future of Russia became one in the same. Thus, pride in socialism (the call de jure of the 1920s) became intertwined with pride in Russia just as things were slipping back into conservative roots socially.
While one can argue that there was at least some reason for the occupation of Poland - though the massacre of Polish military officers and the co-operation between Soviet Russia and Nazi Germany during the invasion of Poland makes it difficult to argue - there was absolutely no defensible reason for the USSR to eat the Baltics and Finland. In fact, the original Molotov-Ribbentrop Pact, prior to later revisions, actually gave Lithuania to Germany. Since Lithuania was the obvious springboard for a German invasion of the Baltics and thence the Soviet Union in the north, and once again the Soviets refused to grant independence to these nations after the war, it was also clearly a land grab rather than the defensive move Aleksey_aka_al claims.
Of course it was a defensive move, those same lands had been used as proxy puppets and springboards during the Civil War by Western powers; that they "won" independence was testament to the extensive aid and support that counterrevolutionary forces received from the Imperialists. Of those, only Finland did away with the Reds on their own, the rest had their indigenously-organized soviets overthrown.
As for Finland, I think you agree with me, but for Aleksey_aka_al's benefit, I'll point out that the only reason Finland became a threat to the USSR to begin with was because the Soviets invaded. Finland was not even close to being a Nazi ally before they were forced into such a position by Russia.
Not really. Finland was pretty buddy-buddy with the Germans. And their almost immediate running to them for help should be evidence enough of that.
AFAIK Soviets tried to exchange territories with Finns. Could you correct me?
I've never heard of it before. That's not to say its untrue, you'll just have to prove it is all.