Where can I find split-adjusted stock chart, (if possible, for free)?
(For NYSE and NASDAQ individual stock). Where can I find split-adjusted NASDAQ
composite index or split-adjusted Dow Jones indstrial average? Or, is
there any place where I can find "Market-Cap chart" (if such a thing
exists)? I think that's more
informative than a regular stock chart. If there isn't any, is there
easy way to know the split information? Yahoo finance shows chart with
split points, but doesn't show the ratio (1 for 2, or 1 for 1 etc)

Hello,

All end-of-day timeseries data provided by Yahoo! Finance is
split-adjusted.  Split-adjusted simply means that it re-calculates the
past prices to accomodate the stock-split.

Yahoo! Finance also privdes all SPLIT data.  For example, MSFT's split
data is viewable below the timeseries chart:
http://finance.yahoo.com/q/bc?s=MSFT&t=my&l=on&z=l&q=l&c=

Splits:21-Sep-87 [2:1], 16-Apr-90 [2:1], 27-Jun-91 [3:2], 15-Jun-92
[3:2], 23-May-94 [2:1], 09-Dec-96 [2:1], 23-Feb-98 [2:1], 29-Mar-99
[2:1], 18-Feb-03 [2:1]

There are no split-adjusted nasdaq composite index or dow jones
industrial split-adjusted charts because they are indices, not actual
stocks.  Indices are "baskets" of stocks.  Stock splits do not affect
market capitalization because:

Market Cap = Current Price Per Share * # Of shares outstanding.  When
a stock splits 2 for 1, the number of shares outstanding doubles and
the price of the share decreases by 50% so the market capitalization
remains the same.

If you would like, you can create your own chart to view changes in
market capitalization over a series of time quite easily.  For
example, for Microsoft, go here: http://finance.yahoo.com/q/ks?s=MSFT

1. Create a spreadsheet with 3 columns.  
2. In the first column insert the Shares Outstanding value (currently 10.33b).  
3. In the second column insert the end-of-day market price by
accessing the information here: http://finance.yahoo.com/q/hp?s=MSFT
4. In the fourth column create a formula =(first column) * (second
column) to obtain the market capitalization for any given day.

Since the data is all split-adjusted, you do not need to "undo" the splits.  

That's it!  I believe I have answered all of your questions.

Thank you so much for your comment. Sorry for the delay, I was waiting
for the email notice to my gmail account, and didn't know that I have
to come back to the original question location to see your comment.