Tara Siegal Bernard wrote a good basic introduction to ETFs here (subscription required) on WSJ.com. (Full disclosure: she quotes two authors from this site, David Jackson and J.D. Steinhilber.) In her discussion of ETF fees, she includes the following useful comparison of ICF, IYR and RWR:
Several financial advisers point to the wide variance in cost of ETFs that track real estate: According to Morningstar, the Vanguard REIT Vipers [ticker: ICF] carry an expense ratio of only 0.12%, while the iShares Dow Jones Real Estate ETF [ticker: IYR] is at 0.60%. Nestled in between are the iShares Cohen & Steers Realty Majors [ticker: RWR] at 0.35%, and the streetTracks Wilshire REIT Fund at 0.26%.