Today's link is to an article that came out very recently from the Huffington Post, but it's already bookmarked and been spammed numerous times. The more recent your source is, the better. That way the "that's no longer relevant" counterpoint is underminded.
The Palsbarist argument: The Palestinians want peace but mean old Israel prefers stealing land.
The counter argument: Meshaal's Gaza Speech
"GAZA, Dec 8 (Reuters) - Hamas leader Khaled Meshaal, making his first ever visit to the Gaza Strip, vowed on Saturday never to recognise Israel and said his Islamist group would never abandon its claim to all Israeli territory.That's good enough in its own right, but Elder of Ziyon has the rest of the speech which has good stuff as well. But for this one particular argument, the two paragraphs above are enough.
"Palestine is ours from the river to the sea and from the south to the north. There will be no concession on an inch of the land," he told a sea of supporters at an open-air rally, the highlight of his three-day stay in Gaza...."
This quote shows that the Palestinians (in general) do not want peace with Israel. Hamas is the democratically elected representatives of the Palestinians (until there's another election, which I'm not holding my breath for). Meshaal is Hamas' main leader. Therefore, you can make a extremely strong case the Palestinians don't want peace with Israel and it doesn't matter if the occupation ends, there are no settlements, no blockade of Gaza etc., it won't bring peace. Peace won't happen until "Palestine is ours from the river to the sea". There's no denying it any more. Even the Huffington Post covered this.
If I were you, I would leave it at that. If your Palsbarist opponent tries the tactic of "But Israel doesn't want peace either!" you can either say "Fine, so neither side wants peace, I'm glad you can't deny the Palestinians don't" and/or you can link to this recent statement by Netanyahu (aka the leader of the eeevil Likud party) saying he's committed to a two state solution.
The point is, Palestinian supporters can no longer make a resemblance of an argument that the Palestinians want peace any more, so every time they try, don't let them get away with it.