http://en.wikipedia.org/wiki/Polish_contribution_to_World_War_II
This should give you a fair example of what succesfull partisanship did to the Nazis in Poland. About 0,5-1 mln troops tied down in Poland becouse of those ineffective partisans.
As for resources:
Action type Totals
Damaged locomotives 6,930
Delayed repairs to locomotives 803
Derailed transports 732
Transports set on fire 443
Damage to railway wagons 19,058
Blown up railway bridges 38
Disruptions to electricity supplies in the Warsaw grid 638
Army vehicles damaged or destroyed 4,326
Damaged aeroplanes 28
Fuel tanks destroyed 1,167
Fuel destroyed (in tonnes) 4,674
Blocked oil wells 5
Wagons of wood wool destroyed 150
Military stores burned down 130
Disruptions of production in factories 7
Built-in faults in parts for aircraft engines 4,710
Built-in faults into cannon muzzles 203
Built-in faults into artillery projectiles 92,000
Built-in faults into air traffic radio stations 107
Built-in faults into condensers 70,000
Built-in faults into (electro-industrial) lathes 1,700
Damage to important factory machinery 2,872
Various acts of sabotage performed 25,145
Planned assassinations of Germans 5,733
Also there were about 250 000 polish troops fighteing among various theaters of WW2. Many of which were among the best and most elite units of the Allies. Look up Division 303 - this was a Polish fighter squadron stationed in Britain, which singlehandedly destroyed about 5% of the German forces in Battle of Britain. Look up the Battle of Monte Casino. Look up polish involvment in allied intelligence (most notably the breaking of Enigma code). And many many others, where polish troops prooved to be one of the biggest assets of the allied effort. US did a great deal to fight the Nazi, but stating that it defeated the Nazis by themselves prooves, that you know very little of what actually happened. I dont know Russian or English history as well (which were the other two most notable contibutors to the war effort), so I cant tell you as much about them, but I would bet that they did at least as much.