From: Hobart, Tasmania, Australia
Matrix's The Operational Art of War 3 has heaps of Eastern Front scenarios, with small, medium and large scales. They include Barbarossa 41, 41-45 ones, Bargration, hypotheticals, Stalingrad, Kharkov and many more. Not to mention the dozens of other WW2, WW1, Cold War, modern and near future scenarios. It's an excellent game if you're interested in anything 20th Century warfare. You won't regret buying it.
Korsun Pocket is very good also but much more limited in scope. When World in Flames comes out, you'll be able to play the Eastern Front to your heart's content, with the added interest of Arctic convoys, the Battle of the Atlantic, Japanese invasions of the Soviet Far East, Axis invasions of the Near East, production, politics etc.
Here's a very early (and much lower resolution than the final ones will be) screenshot of the northern part of the Eastern Front early in Barbarossa.