One of my favorite features in Motley Fool Champion Funds is Shannon Zimmerman's monthly update on exchange-traded funds (ETFs) and index funds. Though I'm a stock investor at heart, I believe almost everyone should have index funds at the core of their portfolios.

But there are some index trackers out there that should be dumped, because they simply don't deserve your hard-earned dollars.

Fees are heading downward
A small revolution is under way in the industry that's been very good news for you and me. Vanguard, Fidelity, and some of the other big index fund providers -- perhaps under pressure from low-cost ETFs -- have been lowering the management fees for their products.

Take Fidelity Spartan 500 (FSMKX), for instance. If you have at least $10,000 to invest, you'll now be charged only a minuscule 0.10% expense fee. If that $10,000 is too high of a hurdle, you can start with as little as $500 if you use the "automatic account builder" option, which makes automatic deposits for you on a regular schedule.

Another option is the stalwart Vanguard 500 Index (VFINX), which charges only 0.18% and carries a minimum initial investment of just $3,000 ($1,000 for IRAs).

Top 10 Holdings*

Fidelity Spartan 500 Vanguard 500 Index
ExxonMobil (NYSE:XOM) General Electric (NYSE:GE)
General Electric (NYSE:GE) ExxonMobil (NYSE:XOM)
Microsoft (NASDAQ:MSFT) Microsoft (NASDAQ:MSFT)
Citigroup (NYSE:C) Citigroup (NYSE:C)
Johnson & Johnson (NYSE:JNJ) Procter & Gamble (NYSE:PG)
Pfizer (NYSE:PFE) Bank of America (NYSE:BAC)
Bank of America (NYSE:BAC) Johnson & Johnson (NYSE:JNJ)
Altria (NYSE:MO) Intel (NASDAQ:INTC)
*As of Sept. 30, 2005, for Fidelity; as of Nov. 30, 2005, for Vanguard.

Is it time to dump your index fund?
When it comes to index trackers, you can expect that, on average, your fund will lose to the index by the amount of its expense fees. And while the gap between 0.75% and 0.18% may seem small, it's actually a big difference that can cost you big money over the years. "With that in mind," Shannon says, "there's simply no reason to pay any more than you absolutely have to for a fund that merely tracks a benchmark."

Check out your index fund's expense ratio, and see how it stacks up with competing products. If it's significantly higher, you should definitely consider moving your money into a lower-cost fund that tracks the same index.

More fund fun
The monthly "ETFs & Index Funds" feature in Champion Funds is an interesting read that can profit any index investor. It certainly caused me to scrutinize my index fund's fees.

Shannon is offering a free trial to his newsletter, which allows you to access every pick he's ever made and every index fund column. His recommendations are beating the market and equivalent benchmarks 17% to 9%. Try it for free for 30 days, and if you don't like it, it won't cost you a penny.

Rex Moore indexes in his 401(k). He also owns shares of Microsoft and Procter & Gamble. Microsoft and Pfizer are Motley Fool Inside Value recommendations. Bank of America is a Motley Fool Income Investor recommendation. This information is brought to you by the Fool'sdisclosure policy.