I highly recommend reading The Bible Unearthed. I really enjoyed it and it does a great job of looking at what archaeology reveals about Israel's early history. As MP noted above there is little to no evidence of a mass of people being in the described locations. It also shows that in those days places like Jericho and Jericho weren't major landmarks, and many occasions where the best archaeological evidence available tells a very different story to that of the first few books of the bible.
I like readings lots of different things to hear different points of view, and I this was most excellent.