Reason.tv has just released an excellent six minute video on urban renewal, focusing on several blocks of Manhattan's Upper West Side (around 99th street) bulldozed to make way for new development. It's definitely worth spending some time watching. Of course, eminent domain was used to clear the slums. Another, complimentary video showing how eminent domain for redevelopment can be avoided, using Anaheim, California, as a case study (Drew Carey Video #5) can be found here. (See also the video on eminent domain abuse in National City, California here.)
For those looking for something a bit meatier, check out Florida State University economist Bruce L. Benson's recent (2010) book on Property Rights: Eminent Domain and Regulatory Takings Re-Examined. This book may be the most up to date free-market view of eminent domain, takings and redevelopment on the market.