Here is an article from AAIIMoney that evaluates in detail the SmartMoney.com, Morningstar.com and Wikinvest portfolio trackers. Its pretty good.
http://www.aaii.com/computerizedinvesting/article/the-top-online-portfolio-trackers
This Comparison article examines the top online portfolio tracking websites for individual investors. The focus here is on everyday investors and not on power traders or institutional investors, so top sites in this category should have a good balance of power and functionality, along with a reasonable price tag. In addition, expect these websites to be user-friendly. The three sites designated as the best in this year’s comparison are SmartMoney.com, Morningstar.com and Wikinvest.