Can't help you with the Naz, but the chief difference between the Naz and the Dow/S&P is financials. Try bigcharts.marketwatch.com and choose "Industries" at the top of the page. They used to focus on the S&P sectors (9) but they now focus on Dow sectors (17). Click on a sector and you'll get the groups within that sector and sometimes the subgroups within each group. You can also select charts for each stock, subgroup, group, and sector.
Db