Google launched Portfolio Charting on Google Finance. Now you can graphically track your portfolio's historical performance either individually or versus a specific stock or market index to get an instant snapshot of how you're doing.
To get started, visit Portfolio page and scroll down under "Portfolio related news". From here you can see your portfolio's total value over time or zoom to a specific date. Use the graph to compare your portfolio to indices like Dow, S&P 500, and NASDAQ, or enter a symbol to compare your portfolio to a particular stock.
The graph uses transaction data you've entered or uploaded for your portfolios to display market value of each portfolio at a given time. If you haven't entered transaction information for a portfolio, we make some assumptions to give a general overview of the stocks you've selected.
More Info: Help Center