Possibly the best reference site for the history of Israel and Zionism on the web is Ami Isseroff's zionism-israel.com , and its sister site MidEast Web. Without a doubt, Isseroff is the most knowledgeable blogger on Israel's history, and his websites are truly encyclopedic (although not as well organized as they should be.)
For a stellar example, see Isseroff's review of the new Benny Morris book, 1948: A History of the First Arab Israeli War. And check out his links.
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