http://www.stocktradingtogo.com/2007...lio-with-etfs/
First off ETFs trade like stocks so they are much easier to trade and cost less to purchase and sell.
Secondly and more importantly, the majority of time they have much lower management fees than mutual funds. Take the SPY for example which is the ETF tracking the performance of the S&P 500, it only has a management fee of .09%. That is very cheap to replicate the performance of the overall market vs a mutual fund that would otherwise charge 1, 2, or even 3% or more for the same thing.
PS - To find and research great ETFs I recommend using
Morningstar. They offer everything you could want and more as far as fund research so check them out.