One feature of Fidelity.com that I have found particularly useful is the "cost" view of my accounts. Basically, this allows you to see how much a stock or fund has appreciated -- or declined -- since you bought it, in both dollar terms and percent. This is great for tracking your investments, and also getting a handle on capital gains taxes if you are getting ready to sell.

The tax help is particularly important. Long-term Fidelity customers will remember the bad old days of trying to figure out "cost basis" of stocks and funds at tax time. Fidelity didn't provide this info, which meant you had to hunt through old transaction documentation for the time you originally bought something, and how much it cost. The "cost" view on Fidelity.com partially alleviates this situation, by providing the amount you invested, including re-investments, but it still doesn't provide the time you bought it. Also, the "cost" values reset themselves if you change the status of a non-taxable account -- for instance, rolling over a 401K to an IRA, or converting an IRA to a Roth.

To see the "cost" view, log on to Fidelity, select an account, view the positions, and then click the "cost" link in the top-middle section of the chart. You can set this as the default view every time you view the account, by clicking the link that appears.mortgage calculator