Updated 8th July 2013: removed broken Bing link, added Macmillan and Baidu links.
In our class on meetings, we saw the phrase "agree to disagree", which might be a strange phrase for students of English.
The way it's usually used is to stop arguing/disagreeing about something but in a friendly way.
Alice: "I've just explained why rice is a million times better than noodles."
Bob: "Well, I still think noodles are better than rice. I guess we'll just have to agree to disagree."
Alice and Bob disagree. Bob recognizes and confirms that they still disagree and that they won't be able to reach an agreement, His sentence with "agree to disagree" brings the argument to an end in a friendly, respectful way. Alice still believes rice is better and Bob still believes noodles are better, but they will try to stop arguing about it and try to maintain a courteous relationship.
You can also say "agree to differ".
Here are some links with more info and examples:
G.A.L.E.S.L. / joe3
Some tips and links on learning English.