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You can get lots of unbiased information on funds and ETFs at Morningstar.com,
which has its own index family.
Their Instant X-Ray tool lets you view a fund's inner workings.
This Morningstar article details the tax efficiency of ETFs.
Yahoo! offers this convenient ETF browser.
More specialized articles are available at IndexUniverse.com.
For details on specific popular indexes see the websites of
Standard & Poor's (and Barra), The Frank Russell Company, and Wilshire Associates.
There are still other index families constructed according to different methodologies.
Two extreme cases: DFA does something extremely simple (like a non-handpicked version of S&P/Barra);
MSCI does something extremely complicated.
IndexFunds.com is a sales site for IFA, which is a retailer for DFA.
This article explains the rationale behind the different methodologies indexes use.
The Vanguard Diehards is a lively (and informed and courteous - wow!) forum on indexing.
For real diehards, here are Vanguard's reasons for their switch from S&P indexes to MSCI,
plus a different take
and some background.
For information on ETFs, see
ETFzone.com
(or their section in Yahoo! Finance)
and iShares.
The Efficient Frontier has a lot of relevant articles, including
this one on how index funds can beat their indexes, and
this one on the practical versus theoretical differences between index funds and ETFs.
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