Somebody who lived in the middle east posted this on my Ferrari board - I had no idea that these dietary laws went into such detail:
The slaughter must be ritually done (in a religiously based ritual fashion) For Halal that means the name of Allah has to be invoked individually on each animal to be slaughtered where for Kosher, it is sufficient to recite the name of God or grace once for the day for all slaughters.
Islam considers the entire cattle or sheep as Halal if duly slaughtered but Jews use only the fore-quarter as Kosher and consider the hind-quarter as non-Kosher.
Meat of rabbit, shell fish, wild hens, goose, and duck are considered permissible in the eyes of the Islamic Law but they are prohibited in Kashrut or Kosher law.
Islam prohibits all intoxicating alcohols, liquors, wines, and drugs. However, Kashrut considers all wines Kosher.
Mixing dairy and meat is prohibited in kosher foods, but is not an issue in halal.
Gelatin is considered Kosher (regardless of its origin, even from non-Kosher animals). If the Gelatin is of non-Halal (e.g. swine) origin, then Muslims consider it as Haram or banned.
In cheese making, the end-product is regarded as Haram if enzymes from non-Halal sources are utilised.
According to Kashrut, enzymes are considered mere secretion and thereby all cheeses are Kosher, irrespective of the sources of the enzymes, even though they may be from non-Kosher animals.
Kosher and halal foods are similar in that both prohibit the use of pork, pork products and blood in food.
So... you can get a Halal chicken pesto pizza with cheese but it would not be Kosher. To be kosher, you can only have a vegetarian pizza with cheese or a chicken (but not sausage) pizza with no cheese.
Then, somebody else posted that to be strictly Kosher, you would have to have two kitchens - one for dairy products, another for meats. And that you cannot eat dairy products after eating meat products for four hours. I believe they said that you can eat meat after dairy food immediately, but not both at the same time.
Wow - how do these people have time to do anything (including praying five times a day or going to synagogue) after going to so much trouble about food?