Here
http://en.wikipedia.org/wiki/Allied_war_crimes_during_World_War_II
And much more here
http://forum.axishistory.com/viewtopic.php?t=53295
Some actions, things which are maybe not all war crimes. Decide yourself.
Captian John Frederick Walker, was a sucessfully english U-Boathunter. One time he hunted again a german uboat and could finaly sunk it. Those who could flew out of the sinking uboat cried for help. Mr. Walker odered to shot some waterbombs among them. Some of the castaways died. The rest got fished up and were treted correct as pow`s.
"The white in the eyes of the arian scumbags could be seen, when I instructed the attack. A fate-heavy moment - however the Damoklessword did not hang this time over their heads, but it came from downside"
The Laconia incident
http://www.uboataces.com/battle-laconia.shtml
sorry much to read, but better than to give you a short summarize :-). But the outcome was the order not to save any castaways anymore.
"1) Every attempt to save survivors of sunken ships, also the fishing up of swimming men and putting them on board lifeboats, the setup right of overturned lifeboats, the handing over of food and water have be discontinued. These rescues contradict the primary demands of warfare esp. the destruction of enemy ships and their crews.
2) The orders concerning the bringing in of skippers and chief engineers stay in effect.
3) Survivors are only to rescue, if their statements are important for the boat.
4) Stay hard. Don't forget, that the enemy didn't take any regard for woman and children when bombarding German towns."
http://www.uboat.net/ops/laconia.htm
The massive bombig raids could be handeld as war crimes, which would include the air raid on Dresden.
The allies announce that jet-propelled aircraft will soon to be in production. The Air Ministry says that Bomber Command dropped 157,000 tons of bombs on Germany in 1943, while the Luftwaffe dropped only 2,400 tons on Britain. (well but fairley to say, the Allied got more resources, what the germans didn`t had, possibly they had then bombed the same as the allied did on germany)
http://www.worldwar-2.net/timelines/war-in-europe/european-air-war/european-air-war-index-1944.htm
Between 1939 and 1945 the Allies dropped 3.4 million tons of bombs, An average of about 27,700 tons of bombs each month.
http://www.world-war-2.info/facts/
Somethign generally of the air raids
http://globalfire.tv/nj/03en/history/extermination.htm
Operation Chastise - it caused the death between 1300 and 2400 people, more than the half of them were allied pow`s (different sources give different death tolls)
http://en.wikipedia.org/wiki/Operation_Chastise
Well choose yourself if the heavy allied bombing raids on german cities pushed the germans to fire their v1 and v2 on english and beligsh/dutch cities. However the "V" stands for "vengeance weapon" which is an creation of the nazi propagandaminister joesph goebbels.
Bombs and Guns
http://www.youtube.com/watch?v=OLMAEhVq2ok
http://www.youtube.com/watch?v=SMMla-Rq0JA
http://en.wikipedia.org/wiki/Bombing_of_Cologne_in_World_War_II
Map - Destruction of german cities
http://img73.imageshack.us/img73/2923/scannen0001kopiejb1.jpg
Rape and American GIs in Europe during World War II
http://www.palgrave.com/products/title.aspx?PID=277181
http://forum.axishistory.com/viewtopic.php?t=30923
Read the info right please
http://www.youtube.com/watch?v=dQWv9KpDWEg
http://www.youtube.com/watch?v=aJ7N9E58dWo
Not a war crime but interessting. If the Americans would not had conflict with the Russians, the Americans would may used the Morgenthau Plan instead of the Marshall Plan. After the Nazi government got knowledge about the Morgenthau Plan, they used it for propaganda against the Americans.
http://en.wikipedia.org/wiki/Henry_Morgenthau%2C_Jr.
Another thing which is maybe a war crime but no killing was the looting of german artobejects.
http://en.wikipedia.org/wiki/Looted_art#Looting_of_Germany
The Quedlinburg Treasury got famous
http://en.wikipedia.org/wiki/Whitewright,_Texas#Quedlinburg_treasures
It was forbidden to stole, but it seems some Americans could do it.
you can slo pointe the 10 commandment of the german soldier (but which come untrue in the war at last)
http://ddickerson.igc.org/german-soldier-rules.html
Well it said that the Attack of the Japs on Pearl Habour was a result or no, the attidue agianst the japs was one reason why the japs attacked pearl habour.
No crime, but macbare: the skull of japanse soldier as a present for an gis girlfriend in the usa. published by Magazin LIFE
http://www.wfg-gk.de/sgeschichtebild25.jpg
At last, germans and japs killed more, but if you kill 1 against law standards or 1 million its both crime. And it seems that always the others are worse. "Yes we did this, BUT the others did this and this and that" seems the others are always guitly. the germans should have do more against their nazi gov, but it was war. and in war no nation is free from crime. it seems sometimes "the german shouldn`t had start the war" TRUE, but it seems since they did and did all the crimes it was ok for some allied soldiers to do the same in small way. Some soldiers were frozen to the germans because of the KZ`s they liberated. On the other hand as i said it was maybe for some soldiers an aliby to be rude,e tc.
anyway war is over now since more then 60 years. thankfully.