Hussein Agha and Robert Malley - Middle East Triangle - washingtonpost.com: "The truth is, none of these two-way deals is likely to succeed. In tandem, no two parties are capable enough to deliver; any one party is potent enough to be a spoiler. There can be neither Israeli-Palestinian stability nor a peace accord without Hamas's acquiescence. Intra-Palestinian reconciliation will not last without Israel's unspoken assent and willingness to lift its siege. Any agreement between Hamas and Israel over Abbas's strong objection is hard to imagine."
Also see this earlier post.