Useful phrases, spelled phonetically....
Kamsa hamnida = "Thank you"
Anyong haseyo = "Hello" or "How are you?"
Olma eyo = "How much (please)?"
Kkakka juseyo = "(Please) discount it"
Jo hayo = "I like it" or "It's good" or "OK"
Mashi soyo = "Tastes good" or "Delicious"
He juseyo = "(Please) do it for me"
Pali pali he juseyo = "(Please) do it for me faster"
An mebge he juseyo = "(Please) give it to me not spicy"
Mebge he juseyo = "(Please) give it to me spicy"
Me woyo = "It's spicy"
Cheon won = W1,000
Ee-cheon won = W2,000
O-cheon won = W5,000
Mahn won = W10,000
Ee-mahn won = W20,000
O-mahn won = W50,000
Mahn ee-cheon = W12,000
Mahn o-cheon won = W15,000
Ship-mahn won = W100,000
Ee-ship-mahn won = W200,000
O-ship-mahn won = W500,000
Yogi-yo = Literally means "(Please) over here", but can be used as "(Please) come here". Useful in restaurants and don't be afraid to yell it out at busy restaurants if you need to heard. You can also say this to taxi drivers to ask them to "(Please) stop here".
Or go to http://del.icio.us/ and put "learn korean" in the search box.