I do not now of any credible and critical Israeli or Zionist historian who believes that Israel was facing an imminent attack. Although many do believe that their was a legitimate threat. Avi Shlaim of Oxford for instance maintains that the war was still defensive in nature although there was no serious threat of imminent attack.
In the past, on the one side Israel claimed that other Arab countries led by Egypt were planning an imminent attack. On the other side Palestinians viewed the war as a planned war of conquest. Most critical Israeli and Zionist historians now agree that neither were the case. But a state of escalating belligerency arose over a period of many years in which both sides are not blameless.
These points are documented by several Israeli and Zionist histories and supported by the record of Israeli and U.S. government archives. One excellent book on this matter is by Israeli historian Avi Shlaim of Oxford in his book, "The Iron Wall: Israel and the Arab World". Amazon link:
http://www.amazon.com/Iron-Wall-Israel-Arab-World/dp/0393321126/ref=pd_bbs_2/102-8701952-4352901?ie=UTF8&s=books&qid=1180427457&sr=1-2Two other books by prominent Israeli/Zionist historians which support this consensus of historic opinion are "Righteous Victims: A History of the Zionist-Arab Conflict, 1881-2001" - by Benny Morris -- Amazon link:
http://www.amazon.com/Righteous-Victims-Zionist-Arab-Conflict-1881-2001/dp/0679744754/ref=pd_bbs_sr_1/102-8701952-4352901?ie=UTF8&s=books&qid=1180429051&sr=1-1 And the work by former Israeli Foreign Minister and Israeli historian Shlomo Ben-Ami; "Scars of War, Wounds of Peace: The Israeli-Arab Tragedy" by Shlomo Ben-Ami -- Amazon link:
http://www.amazon.com/Scars-War-Wounds-Peace-Israeli-Arab/dp/0195325427/ref=pd_sim_b_5/102-8701952-4352901?ie=UTF8&qid=1180427457&sr=1-2_________
Actually Salon.com had an article on the subject just yesterday:
"Rethinking Israel's David-and-Goliath past
Little-noticed details in declassified U.S. documents indicate that Israel's Six-Day War may not have been a war of necessity.
By Sandy Tolan
snip:"A key discrepancy lay between U.S. and British intelligence reports and those conveyed to the administration by the Israelis. On May 26, the same day Eban met with Johnson and Defense Secretary Robert McNamara, Dean Rusk, the secretary of state, relayed a message from Israel indicating "that an Egyptian and Syrian attack is imminent." In a memo to the president, Rusk wrote: "Our intelligence does not confirm this Israeli estimate." Indeed, this contradicted all U.S. intelligence, which had characterized Nasser's troops in the Sinai as "defensive in nature" and only half (50,000) of the Israeli estimates. Walt Rostow, the national security advisor, called Israeli estimates of 100,000 Egyptian troops "highly disturbing," and the CIA labeled them "a political gambit" for the United States to stand firm with Israelis, sell them more military hardware, and "put more pressure on Nasser."
As for the Egyptian president, there was a huge difference between his public and private signals. He had threatened Israelis with "annihilation," causing fear bordering on paralysis for a population devastated by the Holocaust. He had closed the Straits of Tiran, a source of less than 10 percent of Israel's shipping, but nevertheless a casus belli as far as Israel was concerned. He had expelled the U.N. peacekeepers from Sinai, further raising fears of war. (Israel, however, refused to accept those same peacekeepers -- a move that would have diminished the chance of war.) And, as the leader of the "Arab nation," Nasser was under great pressure from other Arabs to cut short Israel's nuclear ambitions and deliver the Palestinians back to the homes they had fled and been driven out of in the war of 1948.
But privately Nasser was sending strong signals he would not go to war. On May 31, he met with an American emissary, former Treasury Secretary Robert Anderson, assuring him that Egypt would not "begin any fight." Two days later, Nasser told a British M.P., Christopher Mayhew, that Egypt had "no intention of attacking Israel." The same day he met again with Anderson, agreeing to dispatch his vice president, Zakariya Mohieddin, to Washington, in an apparent last-ditch attempt to avoid war. (Anderson and Johnson had also spoken of a visit to Cairo by Vice President Hubert Humphrey.)
Rostow decided that Israel should know about the secret visit. In a June 2 note to the president, the national security advisor urged that the United States inform Israel of Mohieddin's impending trip to the White House: "My guess is that their intelligence will pick it up." The same day, Nasser sent a telegram to the American president indicating that Egypt would not attack Israel, but that "we shall resist any aggression launched against us or against any Arab state."
the full article does require a subscription to salon.com . But I believe that they will give you a free trial subscription for one day.
link to full article:
http://www.salon.com/opinion/feature/2007/06/04/six_day_war/index.html?source=newsletter